Weathers been minging and Feshie is grass, I would go for Inverness.
Good rail and bus links to Inverness city centre but you will need a taxi out to airfield, and only 45 mins from your hotel to EGPE.
The train station is spitting distance from your hotel.
Feshie to hotel about 15 mins by taxi, no buses.
Theres quite often someone knocking about at Highland Flying School who could nip you into town.