I don’t know that size is the biggest problem with the 26 because if size and suitability for most people’s’ needs determined the size Kettle that they bought, Weber would sell a hell of a lot more 18s than it does and they’d still make the OTG in 18, regardless of how it crept into the sweet spot of the 22 in price.
Unfortunately, I think with it’s $300 street price, the 26 is a bit too expensive for casual users; $200 is about where it should be, but it would probably cannibalize the MT sales at that price...even a step down to $250 would generate more sales, which would hopefully make for accessories for the 26.
Or, keep it at $300 and put it in either an OTP/non-gas Performer/(mini)Ranch cart.