ihave just ben out in my garage for a little test with a GFR front wheel.
The bolt did not come of easy, but in the end it did.
The cover nearly fells off then
So the bolt in the middle is the only thing which holds the cover at it's place. No hidden edges or hooks
So maybe a good soak with WD40 or something like that would do the job.
You can also try to heat the edges of the cover wit a hot air gun (be carefully) for several times.
Would have been better if Luigi had also painted the inside of the spoke.
Good luck, Joachim