Can I commission while enlisted in the Reserves?

That's exactly what I did 4 years into my 6 year contract. You don't want to be dealing with a standard recruiter but an officer accessions type. There are different ones for reserves and active and designator typically as there's a different force mix vs. body count. One difference is you won't get O-1E unless you have 4 year equivalent AD points. That got changed some time after I shifted over in '76. You didn't mention what degree you're getting, but you'll want to leverage that forward into a masters later on depending on what your designator will be. One thing about being MIL, especially officer. You'll never stop going to school for one thing or another. Since your new contract will supercede the current one, your TIS accumulation will keep ticking along. A big number can be leveraged into Civil Service later on as well. I don't know if the Army does what the Navy includes which is passing an interview with a senior officer whom makes a judgement regarding the likelihood you'll do well. I was a reviewing officer up to 2013 and know they still do that for many designators on the Navy side.

When you commission your enlisted obligation is wiped away. Any time you owed was enlisted time. When you commission you incur a new commissioned obligation instead.

Yes, talk to your Career Counselor and unit Commander.