Hello there.
The IAA gave me a free, straight swap for a Czech JAA class 1 a couple of years ago.
Check with their Chief Med. Examiner Mrs Roodenburg (though it was her predecessor at the time), if she would do that.
The initial class one is 60 GBP, but all you would need is the renewal if you have all the papers, which is 40 GBP.
cheers, IP