Jim, Crossunder clarified in his/her second post that the aircraft wasn't to be used for public transport.
That being the case, S/e piston aircraft ARE appropriate to the specified operation.
There are STC'd iceing kits available. I seem to recall P210s having them, some Mooneys & some Bonanzas. All a bit hazy though, so my error rate could be a bit high!
[This message has been edited by Tinstaafl (edited 23 May 2001).]