[Xenomorph]

I'm wondering if it's possible to remove (and thus go back to a previous) weaponset via the GLA worker commandset upgrade, or is this like the LocomotorUpgrade?

[Dibelius]

it's more like the RiderChangeContain logic.
look here: CLICK

Primarily people use this method to make locomotor switches become possible, but besides this another positive effect is that you can change the WeaponSet, Art and CommandSet of your object.
So this will work like the GLA CombatBike which can be manned with different infantry. In this case the infantry riders are just dummy objects who will trigger the events, and nothing more. You won't notice them ingame. But you'll get your desired effects.

[Xenomorph]

Cool. Will this work with aircraft too? I've noticed they tend to have a special place in the code.

[Dibelius]

You should try it at least. I'm not really sure, but think it's possible with aircrafts as well.