In-house florist issues

I am running into a bit of an issue... the venues I want (separate ones for ceremony and reception) have an in-house florist only policy. I’m sure the price of the fresh florals they use at the reception is more than I would’ve ended up paying for silk flowers, but I was okay with their requirement. What was more important to me was getting my own corsages, boutonnières, bridesmaid and bridal bouquets custom made from Etsy using silk flowers. My main flowers are orchids which are not easy to dry/preserve, and I at minimum wanted my groom’s boutonnière and my bridal bouquet to be a keepsake. I also know from my sister’s wedding my parents like to try to preserve their corsage/boutonnière also. The ceremony venue won’t allow me to bring in any outside florals/decor, and I’m pretty sure they also only do fresh flowers. This frustrates me for two reasons: 1) their in house florist naturally has a price minimum which is going to be far more than what I would’ve had to pay for what I actually want on Etsy, and 2) I won’t have the keepsakes. Thoughts??? I’ve had a horrible time trying to find the ceremony venue and this one is otherwise perfect so venue shopping further isn’t really an option for me...