Yes, it's possible! Get missile rack skills to get more than 25 salvos. If it's too scary, go down to MRM30+20 and put in some extra ammo and/or armor and/or speed (pick two).
Replace the 2x mrm30's with an mrm40 and an mrm20. You'll have 1 ton extra to do with whatever you please and almost identical damage output with better cooling efficiency. Use it for a bigger engine or more ammo.
2xMRM30 is ghostheatless (better than 1 DHS) and has the same cooldown, which is why I prefer it as such, but I like the way you're thinking and it's definitely an alternative.