i got through this part with epsxe 1.4, as a matter of fact, i played almost all the game with epsxe.(i started playing with epsxe 1.2 wich freezed at the begining in some parts, but after the second half of the first cd i never had to change emus!
IT doesn't block against deus in the final battle!!!!!
But this part however is tricky, make sure you have a savestate just before this part and keep trying...it eventually goes through the scene without any freezes.
if you have any other questions ask!
BTW i loved the game! great ending!!!!( although i hated the final maze before getting to deus)