Depending on the outer diameter I might have some leftover aluminum round bar that might work as a spacer, would be easy to turn one up if you can give me good measurements of the inner and outer diameter of the barrel ring. They’re 1 1/4” in diameter and 2” in length.
Down right neighbourly of you Bill, I tip my hat to you sir.

Gentlemen, Bill has recognized I'm in a bit of a jam and offers his skills to an unknown person to assist him. Bill, you are the best of what we all aspire to. Thank you, you've made my day.
I have reached out to Tactical Ordnance and they have already responded stating that I am on a waiting list and to bide my time...they'll get to me. I have several shotguns, so I'm not in a rush and am not wanting for peace of mind.
I contemplated incorporating the bushing into the cap, just having a longer mag cap that comes down the outside of the tube to lock in the barrel, but if I'm going to Vang Comp the barrel, having a front blade post soldered on, ported, etc, etc, it would need refinished anyhow, I may as well have them move the ring while it's already on the induction solderer? I'm still on the fence about porting such a short barrel in the event an errant thumb gets in the way while cycling. Installed, the 14" on the Mossberg 835 isn't a small gun, but the action throw is noticeably longer. It shouldn't be a problem, but the forehand can get out near the muzzle, and the porting is about 3 inches back from there. It'll take some getting used to. I may just go the route of threaded chokes for the 14" barrel and Vang Comping my 20" 590A1 retro barrel? Either way, Tactical Ordnance is getting both barrels and the 835.
Open question to the group who are also switching sides, which of the two barrels would you Vang Comp vs. choke tube and why?