I lost a cover on my very first ride through some aggressive brush.
- I did an instant hack of G-Tape at one point and it’s still in use today (hooray for impressive battery life.
- I did a prettier version for my trail bike.
For now, some well placed tape should work, but I am not sure how waterproof you can really get that?
Get some really good adhesion around the oval and do your best to overlap that to the flat side first. Then do some origami on the rounded ends if possible. may well benefit from some “triangle” trimming to get the tape cleanly folded down.