Measurements are the same on their charts, besides the R being 1.1" longer in the body and 1" longer in the sleeve.
I just called them, and they said they only shorten sleeves from the end of the sleeve (not the shoulder) and a max of 3/4". He said I could find a non-Susu tailor that can probably do it - but he said it might be costly and it could mess with the proportions.
I almost want to go back to the shop again, to see how the 36R looks. But I'd have to take the train home, then drive right back past work and even further south. And no guarantee that the suit will even still be available by then.