Unless you go back to purely patched round-balls, you can't get away from ML's being a 200yd + weapon with a good aperture sight, some load work-up with conicals, and a bit of practice.
It doesn't matter if it's got a hammer or inline ignition. I haven't looked, but, I bet I can find a pretty pointy hard-cast lead projectile. For a bit of $$ I bet Accuracy Innovations or Woox would make me a very stable stock/chassis. They'd probably even integrate a Vernier tang-sight mount to lengthen my sighting plane and give me way more vertical adjustment.
Move to external hammers only and you can bet it wouldn't take a good machinist long to make an off-set hammer and ignition chamber for a current in-line rifle.
I came up with that in about 3min worth of thinking. Imagine what a smart person with machining skills could do between now and ML season.......
A handful of states have the very regulation you are talking about and some even have the " not modified" regulation.