If you are concerned, you might want to consult the quilt auction committee about this. The annual quilt auction where I donate has a wide range of technical quality, as well as a wide range of style and difficulty. The good thing is that the bidders have time to preview the quilts before the auction begins. The preview allows each person to decide on their bids based on their own standards. Many people don't have much knowledge, and some don't care, because they are there to support the charity. And for some, your FMQ work will look great!
Personally, I guess my only concern when I donate is that I don't want to embarrass myself. I am not an expert quilter, but I try to do my best on the quilts that I donate to auctions.
It sounds like you have an eye catching quilt, and that counts for a lot in the bidding.