Probably, if Trump doesn't activate the Insurrection Act, nobody else will do anything in a big way.
The time is near where Trump will have to activate the Insurrection Act, or otherwise forget it.
I don’t think the insurrection act will do much for trump. The military was not on Trumps side during the summer when there was riots and a legitimate need to invoke the insurrection act, or at least the top of the military was not on his side. Trump trying to use the military to stay in power is not going to end well for the US, and would probably not turn out well for Trump either.
Soldiers follow orders. They are taught to not question the ethics or reasons, or even to know them.
If the Insurrection Act is activated, it will be based on Trump's 2018 Executive Order. So, there will be enough proof for any military people who need it.

There are obviously limits to that principle. I don’t think Trump invoking the insurrection act is a good idea right now. I don’t see many options for him to challenge the results of the election.
I think Trump should acknowledge that Biden will be President in January (even if illegitimately) and start his 2024 campaign.