LTE hotspot, DD-WRT, and Whonix Gateway

My work is highly mobile and it is important to have a router that the network operator has control over for best security and to ensure that the connection is not disrupted. I am wondering if anyone has built a LTE hotspot with Whonix Gateway in physical isolation within or has ideas about how to create a mobile Whonix Gateway device. Is there a device that can connect to an LTE network (or satellite), has firmware like DD-WRT in which Whonix Gateway could be installed, and could tether to a computer via USB? Thanks!

Not that I am aware of at time of writing.