At this point I haven't worked inside a factory in my 15 years from during and after college that didn't dominantly use metric. So the whole argument of tooling costs and changes is bunk.
Just slowly start moving over the products we buy to list the correct thing (foods). It's no cost difference as products already list both!
For bikes......I do distance in miles and weight in pounds since it's so common. But now that I think about it, zero reason to do so. I could swap my gps over, my bathroom scale, and never know the wiser. I could swap my Google maps and apps over.
Only real things in the old system are structural building dimensions, cooking units, and speed limits now that I think about it.