Alright, not sure if this will help but I got it working:
I’ve installed both mentioned plugins and when I connect to my webservice, I now get a OS-level query on which client certificate to use. It’s weird though, I can no longer use my proxy configured in ionic.config.json (I configured this to avoid CORS errors on connecting to my webservice when I was testing in Chrome using IonicLab) - deployed on an android device, it just seems to work now which is really weird.
Edit:
Yeah, running on ionic serve --lab now no longer works because firefox and chrome are blocking CORS requests. The android WebView doesn’t seem to have any problems with this though. Strange.