I liked the guide but I felt as though you underrated the Undead Lord archetype.
When you brought up the trade offs, you never mentioned the 8th level ability Unlife Healer, which essentially gives you free Empowered healing for undead, and free Maximized and Empowered undead healing at 16th level.
Also, your suggestion of having a custom Staff of Command Undead won't work out as you intended. Because the spell isn't one that you are capable of casting (unless you took the Inevitable domain), you would never be able to recharge it. The solution is to add a spell to the staff the you can cast in addition, such as Animate Dead. For example, if Command Undead was single-charged, and Animate Dead was triple-charged, the cost would be 6400gp.
Staves hold a maximum of 10 charges. Each spell cast from a staff consumes one or more charges. When a staff runs out of charges, it cannot be used until it is recharged. Each morning, when a spellcaster prepares spells or regains spell slots, he can also imbue one staff with a portion of his power so long as one or more of the spells cast by the staff is on his spell list and he is capable of casting at least one of the spells. Imbuing a staff with this power restores one charge to the staff, but the caster must forgo one prepared spell or spell slot of a level equal to the highest-level spell cast by the staff. For example, a 9th-level wizard with a staff of fire could imbue the staff with one charge per day by using up one of his 4th-level spells. A staff cannot gain more than one charge per day and a caster cannot imbue more than one staff per day.