Good luck with your business.... nice looking swingarm... but needle rollers ?, to date all signs say they don't last any time in a road bike ( good for racing ? ) Also is their a 'stop' mechanism to hold/adjust the axle as chain action will pull it forward no matter how tight you tighten the axle bolt.... happens on a stock swingarm when you leave the 2 adjusting bolts/ locknuts loose ( backed-off ). ?
All modern bikes have needle rollers in the swingarm. My 1988 hawkGT and my 2003 FJR do. The service intervals are very generous. I think the key is that they have to be sealed, which the OP says their's is. The CB750 original design, if executed in the HondaMan way, is as good as it can get for what it is. But ultimately a sealed roller is better.
I'm sure they have an adjuster mechanism, looks to be pretty sophisticated just not in the picture. Closing the end of the swingarm is the better design over the open dropouts we have with the stoppers. But not having open ends precludes the use of this swingarm with 4-4 exhausts. Or at least you'll have to remove the exhausts to get the wheel off.
As to the axle, i submit to you and everyone, a properly tightened axle, that is 65-70 ft lbs is the only way to hold the axle. There is no way any adjuster mechanism is designed to or intended to hold the axle from moving. A properly tightened axle will never move and the adjuster bolts can be removed and stowed in one's pocket until they are needed again.
Asking those adjuster bolts to act as a backup to a properly tightened axle is asking for disaster, IMO. If the axle does move, the adjuster is there and its bulk will act to retard the movement, and it will bend, but that was never an intended piurpose.
If the axle moves there was a problem tightening it up, or something else is not right.
They are "adjuster bolts", not "wheel stays".
I'd be polite and say OCICBW, but this is a safety issue and I'll say I'm right. I've seen and read of too many people wanting to line up the cotter pin hole rather than get the nut tight enough. Take it to full torque and if the hole doesn't line up, make it tighter not looser.