Would a heavy investment in Cha and Performance for Lingering Composition be viable?
Probably. By level 10 you can have a +4 bonus to CHA with only a +2 bonus at level 1. It will mean that you have some other stat that you aren't buffing at level 5 and 10, but everything has some tradeoff.
Similar with the skill training. Putting training in Performance is pretty cheap - you get a lot of trained skills, one doesn't cost much. Upping the proficiency at higher levels is more costly, but not exorbitant.
And the benefits on your action usage for pulling off Lingering Composition is huge. Easily worth the investment cost.
Would spending a Focus Point every battle to extend (Courageous or Rallying) Anthem be worth it when the domain focus spells would see less use? (I would have Healer's Blessing, Dazzling Flash, and Rebuke Death).
Most of the time, battles last 4-5 rounds. You should have 3 focus points. Again it is a tradeoff for what to use your focus points for, but three focus spells will go a long way in battle.
Is the amount of support focus so overboard that it becomes boring or 1 dimensional? (My favorite 5e PC was a pure support Bard so I think I'd be fine with this)
That depends on what you decide to do. And how varied the battles that your GM presents you with are.
Your character has a lot of options to use. If you decide that one of the options is drastically better than the others in every combat that is presented to you, then it can end up being very monotonous to do the same thing every round of every battle.
Would I drive my GM insane?
Probably not. Not any more than any other support character would. Casting things like Courageous Anthem or Bless or Heroism are things that have to be tracked and adjusted for round-by-round. If that isn't being automated by a VTT, then it has to be done manually.
But while you might have more options for buffs than a pure Cleric or Bard would, you still only have three actions and a reaction each round to cast things with. Same as any other character. So you do have to choose which ones to use for this round or this combat.
In terms of support, all of that's good given the size of the party. And having to choose between two good options for one's Focus Points would be a benefit, not a drawback. Whether those domains provide good options is a matter of taste (I prefer the booms). And whether it's worth the feat is another question, but with Free Archetype, that's much cheaper, right?
I do question bothering with Angelic Sorcerer, like at all. You can manage the angelic imagery quite well with a singing divine caster angelkin. And it's not because of the Charisma cost (because a Cleric's casting stat is one of the save stats), but because picking up more from the Bard MCD would likely get better value, or from an Archetype that aids defense. You do get to skip over the most problematic levels, so maybe you're fine (esp. if you're alongside a Champion or other PC that protects their neighbors).
I'm glad you recognize the value of a surprise Fireball, as another worry was "pure support" since IMO all PCs in PF2 need an offensive option even if they keep it in their back pocket for choice moments.
And if this drives your GM insane, that's a GM issue. PF2 heavily favors teamwork, it's an intrinsic element of the game. Just make sure your PC isn't so dependent on others it can't operate on its own when pressed.
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I play an angelic sorcerer in Kingmaker, and while i did not take bard but swashbuckler (one for all), i see my role similar to yours.
You don't get the offensive focus spells of a cleric, and no divine font, but sorcerous potency + angelic halo (they stack!) let me heal at least as good.
For offense i decided to steal some force barrage from Nethys (blessed blood).