So I have a 12 year old rescue. He's been on oHPW since I rescued him at 6 years old. Apparently, it's not good enough for him anymore. He won't eat the instant stuff either. I don't really want to use BML. Are there any other options for a staple diet? Or is there any protein I could add to the fruits and veg in the meantime? He won't eat eggs...

I would ONLY use OHPW from, NOT INSTANT, from critterlove or buying wombaroo
high protein powder from Australia. pampered glider is cheapest I have found
when I last did a price check. Also check the expiration date.
You could try putting in JUST the powder first when they wake up, then a few hours
later add the fruits and veggies. also maybe reduce how much fruits and veggies
you are giving them it could be to much and they are filling up on corn and peas.
I used critterlove instant for awhile, they eat it some, but when I got the
wombaroo powder and made it with RAW honey they eat it up like crazy, still do.