Once you start, you'll find the conversion and resetup goes by quickly. I migrated to a dedicated supermicro box as well, in hopes that PFSense could do 10gig without issues. I eventually moved my 6+ year old PFSense build from a VM over to the dedicated box..... and was disappointed. Then PFSense pulled their stunt and I finally just said F-this and rebuilt it.
1 hour - it took me 1 hour to wipe PFSense, figure out the new menus of OPNSense and get everything back online. What I had dragged my feet on for so long, turned out to be a big nothing burger. Zero issues, 10gig speedtests just fine, zero trouble with the NIC and great performance overall.
I'll leave with this - fuck PFSense, what they pulled was rediculous and an insult to homelabs and folks who like to bring production tech into their homes. They turned a great product, one I've implimented into many commercial setups, into a joke - who could ever trust them again?! I'll never recommend them and I won't be looking back.