Mr. Trump and his Republicansfascists have a number of potential avenues available. I expect all of them to come into play.
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Maybe I am being naive, but I can't see it coming to this. If you are going to potentially go this far, why not just halt the election now?
Let's say Trump gets 44% of the popular vote - I wouldn't suspect that ALL of those people would support these approaches. Even if it is 30% of the voting public in support of Trump At All Costs, you have 70% that would be against it. The rest of the world (with some exceptions) would likely not recognize the legitimacy of the Presidency. It's one thing to stand behind a no-mask, open the economy message as an old time GOP governor, but to actively participate in what is essentially a coup - across multiple states? Despite SCOTUS leaning right, Roberts and others are not all Clarence Thomases.
Will there be intimidation, suppression, "letter of the law" tossing of ballots - Yes. This goes on all the time (by both parties depending on the time in US history). Will it be so widespread and coordinated across all levels of government with a broad-based inter-state conspiracy - I really, really doubt it.
A low-mid 330's level EC win by Biden with an ~8% popular vote margin (my CURRENT take) gets a bunch of Twitter bellyaching by Trump (unfounded theories, etc.), no actual concession (there doesn't need to be), and a hamfisted transition period with Trump not attending the inaugural. Then years of Trump tweets attacking Biden/Harris and guest spots on FoxNews.
Like I said, I could be very wrong - and I hope I am right - but I can't see the situation as you describe playing out.