Help Help Pick a New Phone

Hi,

I'm currently on T-Mobile using an LG G3 (VS985). I'm starting to get a little tired of it and it's having some issues lately, so I'm looking for something new, but I haven't found anything that really meets my criteria.

Here's what I'm looking for:
Approx $400 budget
Similar size as LG G3
WiFi Calling (I don't have that now since I have a Verizon LG G3 on TMobile)
NFC
SD Card (if no SD support, 64GB internal is absolute minimum)
Band 12
Replaceable battery (this probably rules out too many phones, so may have to be very flexible on this one, though I really like being able to swap batteries)
Notification light (compatible with LED Blinker or Lightflow)
Rootable (I really want to use Android Pay, so I may not root going forward. I don't want to complicate things further with xposed).
Qi Wireless charging (I do have this now)
VoLTE
Fingerprint reader

Note that I didn't really say anything about CPU/RAM. The LG G3 has pretty much been fast enough in that department, so I'd figure most decent current phones that satisfy most of the above should be fast enough. I really don't care much about the ability to use custom ROMs either.

This is generally in order of preference. I have a pretty poor signal in my house so WiFi calling is pretty important. Think group SMS also runs over WiFi when the phone has WiFi calling on T-Mobile. Group SMS currently kills my phone or messages often come very late when on a bad signal in the house. That's not to say that if something else meets most/all of the critera, but doesn't have Wifi calling, that it's immediately eliminated.

Switching from T-Mobile is not an option.

Suggestions?

Thanks in advance!