Pitching distance differences

[aimpink]

I've searched for this, but I cannot find if it's been discussed here already. Sorry if this is redundant.

Now that NFHS, PONY, USSSA and Babe Ruth have changed the pitching distance to 43' for some levels, what's the proper thing to do if (when) you arrive at a field with the pitching plate at the incorrect ("old" 40') distance?

Assuming that the home team (or groundskeepers) can't/won't move the pitching plate:

Common sense might indicate that if you and the coaches decide that it's not an issue, you just play the 40'. However, I think that might lead to a lot of heartburn about liability and not following the rules, etc. So, I'm thinking that's a bad idea.

I'm also thinking that you might declare the field unplayable, similar to that when it's too muddy.

Or you draw a line in the dirt? (I've seen this done for some younger 10U 35' games).

But in actual practice, what's the approach?

Thanks!