We have a house in Greece and go there for long periods of time but wouldn’t want to live there permanently. Lots of our friends do live there but we have noticed more and returning to the Uk especially if they become ill.
Definitely rent for a year to see how you get on. Would you be able to downsize and keep a small place in each country? Renting one out would bring some income and a bolt hole should you ever need to return to the UK.
Recommendations please, for a stopover on the way to Loch Tay