Between AR and OT, you have some compressors already, and they’re very powerful because they are p-lockable!
I’ve owned and used a lot of hardware compressors. Distressor, Compounder, Drawmer, 1178, P10 optical, etc.
These days I just use OT compressor (p-locked when necessary) into Heat with some env follower on the drive amount. It just works and sounds like a record. Simple combo solution that is very powerful and flexible considering it is a hardware solution.
Try feeding your mixer into OT or AR, so you can compress everything there, and output that to the Heat. Finish 5 tracks in this configuration, study the results, adjust. Buying more gear is rarely a solution to a problem that involves a lot of gear