I can see that this post is a bit older, but I was curious: what was your move? Did you manage to port your WPF application to the web?
OpenSilver can be a possible solution. OpenSilver (open-source framework) can help port the WPF app to the web and popular mobile platforms. (https://opensilver.net/announcements/3-2/)
Disclaimer: I work in media relations at Userware