In the end I decided I'd wait until Garmin comes up with a GPSMap which has both dualband and InReach. But it's turning out a long wait.. They did come up with a replacement for the InReach Mini I'm using so its resale value has also dropped in the meantime :(
So for now I'm still using the InReach Mini 1 + my crappy phone GPS.
However, I love the 66sr. Not only is it fast and accurate, the screen is so much nicer than the 62/64 series. The UI has the same base interface, but looks much refreshed compared to the 62/64. And I love the support for Live Geocaching. No need to plan ahead and do pocket queries, but I can just download caches on-device.
I was first a bit hesitant about the built-in lithium battery (no more replaceable AA batteries), but then the 66sr has more than double the battery life of the 66s (36 hours vs. 16 hours), so it's not an issue in practice for my uses.
It depends how well it works though. And how much fussing around is actually required with that targeting stuff. Of course in an emergency I may not always be able to fuss with it a lot. It depends on real-world usability. I'm sure the various hiking sites will put it to the test when it comes out.
https://hikingguy.com/hiking-gear/garmin-gpsmap-66sr-review-...