pocketstrafe can emulate standard phone keyboard and joysticks, with steamvr is more difficult because the VIVE controllers are not directinput devices.
I didn’t understand if driver4vr uses its own SteamVR driver to get this, otherwise an interesting approach is this
https://github.com/matzman666/OpenVR-InputEmulator
which injects the steamvr commands directly into the lighthouse memory, emulating any device without any driver