Can the PTM chrome 5,6,7 irons be bent to match lofts of MMB-17 irons to make a PTM 5,6,7 and MMB-17 8,9,PW combo set?

Interesting idea. You would run into 2 problems that I see:
1) it’s not recommended to bend clubs more than 2 degrees, so 3 is doable but might ruin the finish.
2) you would create 3 degrees more bounce angle on each club, making them 8, 8, and 9 degrees of bounce, respectively. That’s pretty high for those irons.