I was wondering if something like the following could make any sense:
There is a relatively small number of VDSL supported router-modems, so I imagine that using an all-in-one device isn't always very convenient.
I have BT HH5A, using it as a VDSL modem, router and a switch, running OpenWrt 19.07.2 It's working fine, but I imagine if I wanted to run VPN, it would significantly affect the speed.
I have a Raspberry Pi 3 Type B lying around (not the most capable device, but could be of some service.
So I was wondering if it's possible to have the xDSL modem in the router working in bridge the mode, send the data as PPPoE to the Raspberry Pi that would then do the routing (and act as a VPN client), then send the data back on the same cable to the BTHH5A (which in this fold would act as a switch and AP (I wouldn't mind if the BTHH5A creates another subnet if necessary).
In other words, I want to re-assign the routing part of the network to the RPi, and leave the modem/switch/AP to the BTHH5A.
Does this make any sense, or do I sound like I need some rest?