Hmm, Gordon,
I presume you're in Canada...perhaps you could try and talk to Coulson's??
http://www.coulsongroup.com/aviation_sikorski.html
They fly Sikorski S61's (Sea King) for logging & firefighting.. You might be able to get the carrier hauled out as a PR exercise. I would try that spin.
An S61 can lift 4500 pounds underslung. I think Coulson's S61 aircraft are of a higher rating..5000? if they are in the area,(on a mission or for the season) they might do it for a few hundred $$$. An S61 costs about $4500 an hour to fly so if they were quick (10 mins) you might only pay $450.... or a carton of ???
Otherwise, have you thought of a strip of the hull completely, and then use logs & skid it across to the shore or the lake, then when you're at max ice thickness skid it across on long lengths of timber. 30 or 40 foot. That would disperse the weight to around 4 pounds per foot?! So, with a cable, you would be able to get it to your side of the water.
Ian (in OZ)