I wonder if a through-axle bike is stiff enough to do without the right hand seat stay completely.
That way a drive belt just flips into place with no joiners needed in the frame. It would still have the chainstay to resist compression from the chain
I remember seeing a bike at NAHBS when it was local several years back that was set up almost that way, but it was the left side that was open and right side had stays.
I think the bike builder mostly said he did it because he could, but it also made dealing with flats easier.
Interesting solution to requiring a cut-out in the stay for a belt.
I think I prefer that to the other solution I've seen, which is raising the attachment point of the chain stay above the BB so that the belt simply passes behind it.
