Just get a 25G switch and MM fiber. 25G switches are cheaper, use less power and can work with 10 and 25G SFPs.
I'm not entirely opposed to getting a Mikrotik or something and it just being the oddball out, but it's nice to have everything centrally managed.
EDIT: They do have the PRO-Aggregation, but there are only 4x 25G ports. Technically it _would_ meet my needs for Ceph, and Ceph only.