Mass-produced Reanimating Priests: Exploit?

[NTJedi]

By the time someone has researched level_7 they have plenty of time to buy priests from one location which is only fort/temple. 20 or 30 Indy priests have very little upkeep and would definitely be worth changing into undead reanimating priests by middle or late game. While waiting these priests will be preaching dominion and decoys so it won't be a waste. In any case the strategy benefit is strong enough where it will be seen in both SP games and MP games.

It comes down to whether or not KO and JK feels this strategy taints the themes of some nations enough where a change is desired.