Although Strava seemingly refuse to copy over bike segments to ebike ones their is a posting on the Strava Forum from a user who has written a javascript to do exactly that from your own Strava rides. Definitely works with MS Edge, and it is stated as also working with Google Chrome, so I have now set up publicly ebike segments on Strava local to me. Strava have a limit on how many segments you can create each day so its a case of running the javascript against each ride for a couple of days or more until all the segments have copied across.
Details can be found in the posting by Nick Beeton dated Aug 9 2019 at
support.strava.com
Once you have done the requisite installation the copy segment buttons should appear each time you open an e-bike ride in Strava. One issue I have noticed is one ride remained set as bike and I had to manually change it back to e-bike but that seemed to an odd occurance.