Definitely don't use any chemicals as this will just change the property and make it more difficult. Have you tried a blow drier? Possibly by re-heating it up you may be able to pull it away.

When I was cabinet maker, when we refinished counter tops we would use irons to heat the counter top thus melting the glue underneath allowing us to pull it off. I'm not saying use an iron but the heat from a blow drier "may" release the bond between them allowing you to "slowly" pull it away without doing any major damage.

And in the autobody industry they use the same principal to remove decals and stuff.

Just a thought.
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