I'm looking for career advise from you guys on which route to take.

Background:
32, Bachelor's Degree, graduated from a 141 flight school. Went immediately into corporate 135 flying (King Air's, Beechjets, Lears). Flew air ambulance for 4 years, ~3 as a captain, and I'm looking to get into the 121 world.

Flight Time:
Total: 3,300
PIC Turbine: 1,275
Turbine: 2,450
PIC: 2,100
Multi: 2,500

Delta is my end goal. So I understand I'll need plenty of 121 time for them to even look at my resume, much less call me. I'm in ATL, and plan to commute for a while before possibly moving to a specific base. I'm looking for a quick upgrade and as little reserve time as possible. I'm not certain a walk-on-captain slot would be the right move for me since I have zero 121 experience.

Currently have a Republic Airlines interview for mid November.

What path would you take if you were in my shoes?