Modem And Router Separately

Is it possible to just have Othernet modem and and connect some kind of travel router to it?

That’s not how it works. While the “data” is exactly that - data - it is not routable and so a router of any sort will not be able to make use of it.

You could perhaps connect the DreamCatcher to the WiFi tht eminates from a router and then use the app from your laptop via that wifi. Not exactly what you are looking for I think?