Ha it was late and I get half retarded as the sun goes down. Going to a class would be a bit more expensive with one but not too much more than 5.56. Wolf is bringing in 300 Blackout at reasonable prices off Target Sports USA, or at least was. So long as the gun would run steel case, (which makes me cringe) why not go for it. Even if you don't run it a lot and just shoot it and enjoy it a bit it's America, at least for now. Go for it.
Good luck finding anything right now. Primary Arms has 11.5" Geissele pistols in stock...for $2150. "I'll just build my own!" Great, if you can find a forged lower or good barrel (plenty of 16-18" out there though). If you want in the game right now, you're gonna pay to play.
Right now is not time to get into the weeds of a .300 BO. If you find a 5.56 BCM pistol at a good price then grab it and run like Forest Gump.
We could isolate Russia totally from the world and maybe they could apply for membership after 2000 years.
Is the BCM 300BO still sitting on a shelf? That might influence the process.
Also, since you do not have anything that means you would not be adding something. It might be harder to find ammo, but easier to find the actual gun.
Also in 9-12mo from now you maybe wish you had 5.56 you can troll around for just an upper (remember the upper is just a mail order component). Or maybe by the time things are more normal the availability of 300BO ammo is also.
Last point, saying you will probably only ever have one ever is typically just silly talk, and a second upper is the gateway drug...
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