Mikes VRT bill from 2.5 years ago?
I don't know of anyone that has brought in an 08 in recent times due to the gamble but E90/2s have fallen massively in price over the last 2.5 years, I was looking for one for more than a year before I found mine and they dropped on average between £3-5k in an 18th month period.
I do know of a 2013 E92 LE500 (not mine) that was brought in roughly 18 months ago and I think the VRT was 13k.
I honestly doubt that you'll be hit for anything approaching 10k VRT for one, especially an E90.
Looking at it worst case, even if you were, it's not gonna stand up to appeal.