I looked into this same idea for several hours yesterday and settled on pairing Reta only with Cagri or Tirz only with AOD. Pairing Tirz with Cagri seems likely to slow digestion too much and cause stomach problems for me. I will stick with Tirz plus AOD for now and add a little Reta only if progress stops. Once I get closer to my target I expect to move to Reta and Cagri for ongoing appetite control without raising heart rate or stomach trouble while Tirz is still working well.
I've added a small amount of Reta to my Tirz and am now thinking about including a low dose of an amylin agonist such as cagrilintide or eloralintide. Has anyone tried that combination yet?