I think you may be able to do it via the Global Variables. Within the G.V's you will find something like SPRITEISDEADXXXXX, XXXXXX represents a name in this case. If you have a early save you can either go back and cross reference the variables against each other or make a fresh save and then delete the SPITEISDEAD variable that pertains to the Solamnic Knights, it may work. Good luck dude.
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It's bleedin dark down here, slippery too.

Man, that's a pisser.