Unreal Engine 4 now natively supports the Windows Mixed Reality (WMR) ?

you can look at the different locomotion schemes in the vr expansion plugin template
https://vreue4.com/

it has 8 schemes I think that you can toggle between
You can also look at a utuber named Sir Fansi who has a vid on customizing the loco in the template
he also has a patreon and you could probably pay him to do it as well