I do like your new toy Ross - very nice and great looking bit of kit. Are you taking on the banana from Maf
As moving is out
and renting a garage is out
I agree with others that PPF is the next best option for your requirements, if budget is a limit, for the cost of PPF you could have ceramic coating applied 2-3 times (4-6yrs).
I would suggest not to over think this in terms of options, I would set a budget and see what options, service and protection that will get you. As you are finding looking at lots of options and selecting one, only to find its expensive.
I won't do nothing with a nice looking car like that, at a minimum I'd get a good wax applied like a top end Zymol product, just to help give a little protection against the cover. OR don't use a cover and just jetwash it once in a while.
Ceramic Coating is the next best thing after PPF in terms of looking after the paintwork when using an outdoor cover. Ceramic coatings are great but they aren't fully scratch resistant, if the cover or car is dirty the coating could get scratched. good news: it's the coating getting scratch and not the paint (if its not deep).
Graphene coating is very interesting and could be the next big thing, My testing is currently on hold for this but I will be interested to see how if performs against some of the top current ceramics.