Bridge/Route Segments

I’m not sure of the proper terminology, so I’ve attached a crappy diagram of what I’m trying to achieve. My primary internet is through a phone hotspot. I have a Tenda AC9 connected to the hoptspot. My choices for that connection are WISP or Universal Repeater and I’m currently using WISP.

I currently have the MT300a also connected to the hotspot, but USB tether is an option or using the WAN port to the AC9’c LAN if that would be better.

Ultimately, I want all clients connected to one router w/o VPN and everything connected to the other router to go thru the VPN with all clients being able to see each other.

Is that possible and if so, how?