manipulator you say?
worship Droskar!
(most of the items here do not actually need his worshiping to work, but the theme and the special traits will help.)
first the following hat not only make compulsion spells harder to resist but also help with cheating in dice games and disguise yourself as a dwarf while doing all that!
(no need for actual worshiping on this part)
next if your allowed to craft magical items:
take the toilcrafter trait which actually let you craft +1 weapons and armor without taking a feat, and being able to get craft arms and armor feat without being a caster -let you supply your army of goons with low cost items, along with the following ring and trait it makes it cost even less:
> trait + item ring pay half for crafting items and roll to not waste it BUT with trait you can reroll so on the long run it's about 25% decrease of costs.
-when i used it for every 4 ioun stones i crafted i got around 3 while paying 50% which mean that on average for every 2 i crafted i got one free.
if crafting is not allowed by gm then extended toil is very nice for prolonged spells that help with working less (also 1.5 hours per caster level of unseen servant let you do all kinds of manipulation all by itself. can it also fudge dice tolls for you?)
other option, you can follow Razmir.
as you have levels in bard take this trait and use a scroll of sow thought (i'm so awesome!) to get a permanent +1 to hit and damage. (or until some1 dispel it. on which case you get a new scroll).
also it support one of the more broken effective per cost armors EVER (you don't need to worship Razmir to use, but it's easier to get the GM to allow using it if you are)
you should be able to get one made of mithril to lower arcane fail chance. and unless some1 strike you in melee (where, as a manipulator, you should never be) and make the save (or can see illusions) it give a +9 armor ac with the max dex of chain shirt (+4 or +6 for mithril).
and if they do see through the illusion it's still a +1 chain shirt
Have you thought about going lotus geisha into the prestige class with just a 1-level sorcerer dip, or using sorcerer with variant multiclass bard, or taking sorcerer w/eldritch heritage (maestro) instead of multiclassing this exact way? There are ways to combine these concepts without playing a character effectively 2-3 levels below the others in your party.
If you do stick with the choices in your post above you're not going to have the spellpower or personal combat ability to be a presence on the battlefield on your own. The +2 Cha for sorcerer spells (fiendish sorcery) doesn't make up for the multiclassing. Taking the favored prestige class and prestigious spellcaster feats mitigates this slightly, or I guess unchained rogue 3 / sorcerer 4 / enchanting courtesan 10 could be a self-buffing melee character with a few feats to enhance effectiveness (piranha strike, maybe a combat maneuver like dirty trick) and to save your butt (amateur swashbuckler (dodging panache) or osyluth guile, quicken spell).
It's generally a bad idea to multi-class with full casting classes because you end up with less than stellar DC's for your spells/abilities and then they resist everything you're doing. You won't notice it within the first 5-7ish levels, but in the mid-game around lvl 10-12ish, you'll be contemplating going "Ooops I fell" into every dungeon's trap just so you can re-roll.
The character and game are about story and flavor over min/maxing. I understand that multiclassing a full caster is 'sacrilege' to many people, let alone multiclassing a sorcerer w/bard.
Personally, from mechanical perspective I wouldn't mind a single level of bard. A sorcerer can use a boost at low levels, and the bard level means one or two more spells per day (on the short run), more known spells, bardic performance as another possible action, a wealth of new class skills, a few more skill ranks (at a time where they have the most impact) and a boost to saves. On the long run, sorcerer will be stronger than necessary for the average campaign, so it's completely fine to sacrifice a bit of this power for a better start. Both classes have similar (but not equal) preferences when it comes to ability scores, too.
On the other hand, further bard levels add much less per level, so it becomes more questionable from a mechanical perspective. There are some alternatives:
1) The maestro bloodline to make a sorcerer more bard-like.
2) The Eldritch Heritage feat chain to emulate sorcerer.
3) Variant Multiclassing to add some bard abilities to a sorcerer or the other way round.