I wouldn't say priceless, but every time I discontinue a coin I will get orders with the notes saying "please send me the series 1 if you have any left". I'll even swap it for a series 2 if you'd prefer it
I am not worried about the product value nor am I in any way disappointed with it
When I was a kid though we would dissolve post stamp glue using warm water steam and gently lift them intact off the letter. Is this possible with your holograms or have you taken steps to prevent it?
(Warm water steam might not be the only way, heated alcohol or acetone steam might also work with even better glues.)
How about using clear nail varnish ?
I might, honestly I was just joking around - the ideas of JoelKats might work just fine too.