I think you’d have to find rules to balance it, such as very short range, move or shoot, reload every other turn, very high points etc etc. Let’s face it, a BC can hit hard and those guns hit VERY hard (and have a -4 AS modifier) and either is quite powerful, but together, it would be somewaht overpowered, in my opinion. There would need to be huge drawbacks, beyond just making the guns cost about 15 points each…
I dunno, the idea is sweet but what would the unit actually do in game? Realistically, it seems to me, it would have perhaps 5 shots in any given turn - so I guess with high strength it would be useful for getting ogres and monsters and so on…