One can change drop bars to Moustache bars, or change downtube shifters to bar end shifters, or even "brifters".
Slightly shorter stem?
One thing to keep in mind, if you are serious about resuming riding, and fitness, then the more you ride the bike, the better it will be. So, your back muscles will get stronger. Hopefully you'll lose a couple of pounds. You'll get used to reaching for those shifters once again, etc.