Are there alternatives to driving between Magganos and Fiscarado of an evening . Information about bus and taxi services appear vague.
Definitely no buses I'm afraid so your only option is taxi.
Some years ago the taxi driver we had from the airport to Fiscardo said he lived in Maganos, we didn't book him the tour operator did so I don't have contact details I'm sorry. However if he's still there or if there's another driver in the village I'm sure anyone in the shops and tavernas will be able to give you his details though there may well be a card or other info in your accommodation.
Alternatively there are several taxis in Fiscardo, the rank is adjacent to the town square. You could ask any of them for their card if you're around during the day or you could phone Vangelis on (++30)6984366800
It's about €5 from Fiscardo to Antipata which is about half way to Maganos so I would expect it to be €8-10 depending on where exactly your accommodation is. The driver should be able to give you a more accurate quote.
We stayed at Melmar View last year & Dinos the proprietor's brother has a taxi - I'm sure you could ask at the hotel which is 3 mins from the village. Good luck!