Looking for Permanent Necro Call mod

[BB Shockwave]

I just started a new game with a Mage and was thinking on using an undead-only army, when I learned - from a friend - that unlike Resurrection, Necro Call only raises undead for the duration of the battle.

Worse yet, you cannot get Undead with Sacrifice now with the latest Patch.

Since I was going for a "no losses" game, this is a real bummer. Anyone knows whether it is possible to mod the game so that Necro Call would raise undead the same way as resurrection, IE permanently?