IMHO taking Drain3 for IF is a mistake : you'll end up with 1 RP mages (!!), and even indy sages will have only 4... unless you take either a Sage/RB pretender or a weak dominion, but both "solutions" defeat the basic purpose of "abusing" Templars.
Overall I find IF Ulm weak ond poorly balanced : to get an effective design you need a magically strong (for bless) pretender but also needs to have it master more than one path ('cause your mages are crappy lvl 1 ...), you need Order (as everyone except undeads), Prod (Ulm is resource intensive), Magic/drain at 0 or above (as said earlier, but if you take 2 or more you blow up your MR...), Dominion, and even a decent castle (production) !
What you get are sacred lvl 1 mage-priests and sacred heavy Templars Knights, that are very expensive.
You can't count on numbers, against weak opposition they're not needed, but if faced with strong oppositions they are brittle against magic - so they are a quite risky bet !
Lastly you also lose the quite useful Forge bonus...
