Yeah, figuring *head math before second cup of coffee*... pulling all four LRM racks nets me 24 tons, that's enough weight to install eight SRM-6 racks and convert the ammo bins... that's if you don't care about longevity and just want to dump lunch on someone once or twice. More likely you'd drop a couple of racks for more ammo and maybe a backup laser or two, so call it (for crit space's sake) ten SRM-4 racks, a couple of medium lasers, and a bit more ammo? :-\
(Note: I don't have the record sheet in front of me so I don't know the crit layout of a Yeoman- I couldn't tell you if all this fits or if it needs some monkeying to make it work. Just going off weight alone right now.)
It's a bit underwhelming in terms of range, but that's a war crime on legs if you load inferno ammo. "CROWD, DISPERSE AT ONCE - THIS IS YOUR ONLY WARNING"