I used this double conditional also to recruit carthaginian sacred band. I noticed the temple appeared besides the unit in the barracks description but I didn't notice the CTD problem (I will check it again).
Regarding the obligation to destroy the original temples and build those corresponding to the faction, I used the conditional "requires faction {carthage, }" for the temple bonuses. In that way the conqueror shouldn't get those bonuses and it is worthy to build its own temples.
Even negative bonuses could be included for the foreign cultures or factions to make this effect stronger.
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