There are lots of versions of this highland.  This is in danger of sounding like none of them but it is an attempt to at least resemble a version I heard on a recording of the fiddle player Jimmy Lyons from Teelin, Co. Donegal.  It's far less fiddly on the fiddle than the flute.  If playing it in A is too annoying, just drop it down to G.  The flute seems to like it there but as someone went to the trouble of making a G# key for my flute, I thought I should go to the trouble of pressing it the odd time.