Faster accessibility to the shutoff is what I'm aiming for -- the main
water pipe comes in at the opposite side of the house from the
crawlspace entrance, about 60 ft away and down two 3ft levels, so access
will have to be outside the crawlspace.

The main pipe runs vertically about 12-16 inches from the inside of the
foundation wall, and the first pipe leading off of that is very close,
so major relocation the incoming line isn't an option, but a plumber
could probably move the line closer to the foundation wall (right?).

Is it possible to have a shutoff valve & handle assembly that could
span the distance from the outside of the foundation (6", 8", whatever
it is), plus whatever few inches the pipe is inside the foundation?

Putting the shutoff further up vertically, inside the house, isn't an
option, either, as above this area is living room, nowhere for a shutoff
valve to be hidden as it possibly could be if it was a kitchen cupboard
or something.

THx.