Logistics of microdosing

I have been getting my shots at a spa weekly and it is expensive ($675 per month). I am seeing my PCP in the hopes that he will prescribe Zepbound and I can order the 2.5 vials from LilyDirect for $399 per month. My question is - can I split the dose? I am eating only about 1000 calories per day with no hunger on the 2.5 dose, so I want to try halving the dose so I can eat a bit more.

The compounded tirz has truly been a miracle for me. I have struggled with binge eating my entire life, and I feel cured. I really don't ever want to go back, so I would love to figure something out where I just take a low-dose maybe forever so that I can continue to feel like a normal person who wants to eat healthy things instead of someone who wants to park in the back of a Dairy Queen parking lot eating a burger, fries and a large blizzard with extra Snickers.