I've only done 1 Master-Cleanse so far, but I agree w/ detour.
I did Humaworm last Aug after my MC. If you just started a day or so ago, and want to Master-Cleanse right now, you can stop w/ the Humaworm, MC, and then start back up. I would not rec this if you are more than 1 or 2 days into the 30 day cleanse though. You don't want to create resistant parasites.
If you continue with the Humawor, maybe use the 30 days to mentally prepare for the MC. I really do think it's 90% a mental commitment more than anything.
And if you have a family, it's great to cook extra meals and freeze them so you don't have to do prolonged meal prep while you are not eating. Great for the first few days especially.