I tried this earlier this summer. It left my ass all over the gym floor every time I did it - BUT, I really didn’t feel that I was getting much quality work with my muscles. It’s not like DOMS is crucial after every workout, but I wasn’t impressed with the lack of overall fatigue I’d feel later in the day after Meltdown.
Also, I had to bail early (before I could really trying to see if it was helping my physique,) because some certain moves like push presses were just tearing my shoulder apart.
But no, in response to your question, I wouldn’t modify the program and expect it to work as well.
I totally agree about not modifying the program. Even if you do something as minor as swapping the push ups for bench press, you will not quite get the same effect.
Remember that the meltdown circuits are structured in such a way that lactic acid production is maximized.
This will happen with bench press, but not as well as with push ups, especially if you follow the tempos recommended by Don Alessi.
BTW, it is vital that you follow the tempos exactly as prescribed (tempo speed is the ‘magic ingredient’ here). Otherwise, you may get nothing out of the program.
About program modifications, i think it depends of the reasoning behind them. For example, after some point the pushups get too easy, if in the last circuits you can do a more than 10 with feet elevated and hands in DBs (for more ROM), the DB bench is a good substitute if dont have a weighted vest etc to make the pushups harder.