Check out the Zynthian, it is a monster of an FX box and has a lot of quality stuff built in - plus, it has the ability to host VST's and in fact is set up to do that out of the box for the PianoTec VST's, so it may not be that difficult a stretch to get Valhalla running under Zynthian, too .. and once it is, you'll find yourself in a whole universe of power. ;)
Zynthian looks cool but it runs Linux on Raspberry Pi 4, so it probably won't be any easier trying to get Windows plugins to run it than on a Linux desktop system.
http://zynthian.org/