I am just going to put this in to disagree with anyone recommending adding extra peptides to a super tiny dose of reta. Until you have been on the drug at least a few months and got the dose up to 4mg at least ( unless you respond well to low doses and do not need to increase that much ) , you are not going to have much of an idea of how well it will work for you in terms of controlling appetite and in terms of side effects. Everyone saying reta has less appetite suppression than tirz might be accurate, but the difference is actually small, the simple fact that reta causes more weight loss than tirz makes it basically impossible for it to cause less or at least much less appetite reduction, even accounting for the glucagon agonism pushing up energy expenditure 100-200 kcal/day at higher doses.
Reta is currently the most effective GLP there is for weight loss, so if you start it you should give it an adequate trial to see how well it works, and at current doses it should not be causing much appetite reduction, doses will need to go up. Adding in extra peptides at this stage is going to make it extremely hard to work out which peptide is having the effect you want or side effects making future dose decisions more difficult. And even if the risk is only a few percent , drug allergies are not that rare and doubling or tripling your risks for no real benefit is not a great idea.
I have no issues with using combinations for severe obesity when further weight loss is needed at maximum doses of one GLP, and sometimes it is useful if doses are limited by side effects, but hunger is still a problem, but this mainly applies to adding in low dose cagri as it is the only one working on different receptor systems. I think a lot of the people on middling doses of tirz plus reta would do just as well on a larger dose of one or the other.
What you want to achieve, reducing food noise and the compulsion to eat should be very achievable, not sure how overweight you are, but assuming side effects are tolerable gradual dose increases should get you there. If reta specific side effects are a major issue, due to sympathetic nervous system stimulation causing issues like insomnia, switching to tirz would be a better solution than adding it to reta. Not going to help much if the side effects are more general GLP ones like GI side effects.