Our advice would be to hold off until he gets out. Create some memories with real wedding pics and not those of doing this while he has his prison uniform on. BUT, if you are hell-bent on proceeding, then you should call the chaplain and see if they will do the ceremony.
https://www.inmateaid.com/ask-the-inmate/i-met-and-fell-in-love-with-a-man-and-we-are-absolutly-crazy-in-love-we-had-plans-to-get-married-and-now-he-is-locked-up-in-bledsoe-we-both-still-want-to-be-married-and-would-i-contact-someone-particuliar-in-the-prison-or-the-chaplain#answer
Accepted Answer Date Created: October 03,2019