u/AgnewsHeadlessBody

I think this could work out.

Tandem warhead - more damage, less range or capacity.

Thermobaric - effective against humans not so against vehicles.

Smoke - long range smoke delivery would be cool

Tear gas - disorienting like a flash bang.

Anti- air - no tracking but detonates based on proximity and has a Flak effect.

Incendiary - larger effect than the grenade, does nothing to vehicles.

You could make a backpack of chosen rounds and switch between them.

Other variants for the other launchers could also be done easily.