Can't argue with any of those, although it's worth pointing out boosting Union of Spirits would require new spells to be added rather than acting as a passive boost (unless they redo the AA/spell code - all due to AAs being level 254 spells). Alternatively, the equivalent of Healing Adept for HoTs would work, if such a thing existed (maybe that'd make a useful AA line!)
As for quickened Unity, not going to happen unless they change the cast time. We already have 50% spellhaste for it (it's the reason Unity was changed to have a duration) and you can't go over that 50% spellhaste cap easily. There used to be a way around it by gettign a debuff from a LDoN trap, which gave spellhaste by mistake - think it was meant to be a spell slow effect.
http://lucy.allakhazam.com/spell.html?i ... ource=Live was the debuff.
EDIT: That gives me an idea for an AA or spell though - if a debuff can go against the normal rules, an "increase spell haste by 50%" debuff would give us instacast spells. Add say a 2-hit counter and you have an effect which makes the next two spells have no cast time. That could be handy in times of emergencies...
I'd like to add a request to fix third spire too, so that it actually does something - at present the boost is so small as to be within the margin of error for parses.