I wouldn't bother looking at changing channels, the 27mhz are cheap, Uniden or Axis do a 10 channel unit, not sure what channels it has though, l just refused to sell them due to my own ethics, happy to get you a few prices though.
Incidentally I recently had a chat with a marine rescue officer, basically they will monitor 27mhz unofficially for years to come, as I suspected due to duty of care etc. but he did believe that the government was going to legislate that 27Mhz cannot be sold shortly (this year), I have not been advised this yet by GME, so am not aware
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