Ability to prefer `!=` to `≠`

[rainersigwald]

I know a lot of people really like ≠ as a replacement for !=, but I'm not among them. I was excited by the promise of turning off the ss01 stylistic set to avoid ≠, but it didn't work because (I think, based on the table on https://monaspace.githubnext.com/) it's also included in the dlig stylistic set, most of which I do want.

I think my ideal setup would be a way to opt into a space-adjusted glyph that's the inverse of the very nice =!, but out of ≠.