The thing about a lever is 458 Socom, is the 45-70 pretty much matches it (modern rounds) so I don’t think you’ll ever see one, and there are enough 45-70’s or 450 marlins. I think Ruger makes or made a 458 socom bolt gun, sounds like a fun rig, but again for a thick Bush heavy hitting rig, a lever is still very handy and can be chambered I an equivalent caliber so it is a bit of reinventing the wheel.
Something like a T97 rechambered/rebored to 458 socom would be cool, but late for that though..