Bryi0 discovered you can quick-switch lock-on rockets: • lock on instant swap
To do this, just press the mod swap key after firing the rockets and immediately switch to a weapon of your choice.
The combo potential on Marauders is pretty high, here I have just a couple of examples with a single frag and feet-ballista or heat blast (you probably don't need full charge).
Maybe I'll try other versions in the future, to be completely honest I don't like this very much. LOB is already pretty overpowered as it is