Are you opioid naive? If not, what is a regular dose of codeine/dhc for you? And what about the benzos?
I'm hesitant to give recommendations on opioids+benzos because of the very real risk of respiratory depression.
I wouldn't take more than 120-140mg of codeine and ~0.5mg of alprazolam, although it would be safer to start with 0.25mg and redose if necessary (remember you can always take more but you cannot "untake" anything, better safe than sorry).
Kratom is much safer when it comes to respiratory depression, the main risk would be taking too many benzos and passing out and/or getting sick (never ever fall asleep lying on your back).