Note that one of the merits behind an effective modern army is its ability to maintain regular troops that are trained, equipped, drilled and rotated with a reserve on a regular basis - something that's usually achieved with a centralized form of organization and is backed by resources that in the current day are provided by a state. What's the plan on providing modern weaponry, persistent intelligence, as well as infrastructures for logistic, communication, ordinance etc' for a militia that's "transitive" by nature? who's going to keep an eye on those resources and make sure they don't breed power tripping warlords, terrorists or even simple crime organizations? what's the plan on keeping track of munitions and deadly weapons after the militia is disbanded?

Employ decentralized resistance / guerilla warfare. This can be extremely effective.

Highly effective to a degree and can still be bleed-out, toppled or at the very least kept under control with a more organized army. Also decentralization can easily turn to feudalism with armed groups if they start going against each other for whatever reason, such as in the case of political subversion exploiting inherit weaknesses in a non-centralized structure (divide and conquer, etc').

If allies and neighbors are watching, engage in nonviolent resistance. This is difficult and requires getting the message out to other groups and the attacker’s constituency to pressure them.

What's a nonviolent resistance going to do to a threat actor who's eventual plan is political subversion and/or an incursion? why would they give a s*it as long as the war-effort on their side goes uninterrupted by the target or their allies until they decide to escalate?