I was 1KMM for years & in terms of last minute upgrades or irreg ops, I was just told you're 1K (no mention of MM), wait a moment. Having said that, I've also gotten a few 1KMM hang in there. But maybe that was just on-board. So who the heck knows?
Now that I've dropped to 1PMM I expect nothing. It's going to be a learning experience for me I'm sure (ie, I haven't flown E int'ly siince '96

), especially since the other day I was thinking I'd get a couple CR-1s for my upcoming LHR trip - 'til someone pointed out that I was no longer 1K.
So - to the OP, probably not. But good luck!
Cheers.