I'm 54 now (my avatar is me much younger it seems!). I've just sent some more feedback to the LBS to see what he says. He seemed to think again that the XL will fit me perfect. But he did say they're getting a large in January, so I asked if I could buy that one. At this point in time, I may not care what colour it is, just so that I could have one for the start of riding season. And to hopefully not further delay my own order, which was not a custom order. Just a stock XL M-10 in coal blue.
And I'm the same height as you and same inseam.
Buying a bike without first riding it not the best way to go, but it's really hard to do it right in this crazy year. I almost bought a YT Decoy and getting the size right was my biggest worry. Well, it still is it seems

. But it was nice to be able to ride the Occam, which the Rise is based on. I don't recall it being the wrong size in feel for me. I'll go back to the LBS and take it for another spin once all this darned snow we had last night subsides a bit here in Calgary.