Be smart about it. 'Perfecting technique on easy groomers' doesn't sound that much better than not skiing to me. Might not be worth the risk. I don't think you would improve your skiing much that way. You probably already have the skills necessary to ski slow and easy excellently. The advanced skills you want to develop generally require higher speeds.
I don't know, skiing slow on easy terrain without poles would probably up my game a bit, but in my case, there might be some falling involved. I just think when you return to skiing you should just cruise, don't work on anything. Take a leave of absence from your ski school and training for exams. Work on getting your shoulder better, forget about working on your skiing for now.
Easy groomers on small eastern mountains don't sound like a lot of fun to me, but the easy groomers in Colorado might not be too boring, long runs, great snow, beautiful views. If it was me, I might hang the skis up until I was healed up. If I had a ski trip out west, I'd go, but I'd stick to easy groomers and I wouldn't even try to carve, just steered turns. You may be able to arc turns without risking a fall, but I can't.
Of course, you know your abilities and can assess your rehab much better than I can. When you do ski, be careful.
Misery loves company, so if it makes you feel better, I broke my arm at Whitetail in the waning hours of last year. I don't ski much anyway, so I'm not out of sorts about not being able to ski for a while, but not being able to ride my bicycle is killing me.