The OEM pump for the S3 and ED30 with K04 is not an updated one so I'm sure it shouldn't be too hard for them. It's only a case of winding back the requested fuel pressure and prop a bit of boost and timing (I'm no expert so could involve more but the point is I'm sure they could.) Have you asked them if they could and how much etc.
At the end of the day it's your choice mate. Would be a shame to see it go though when you could get a fair bit back for it.