Hihi, first post here, so feel free to let me know if I've violated any etiquette! Apologies for the post length, but our circumstances are quite "unique".
Our son is 18 months (about 80-85 cm & 12.5 kg). We live in France and don't have a car (city-based). Until very recently we had got by with an infant car seat borrowed from a colleague (Cybex Atom 5) that we used precisely 4 times: to get him home from the hospital, on a daytrip to Germany, once to the hospital when the trams weren't working and finally last month for a wedding. Now he's getting older, I've joined a local car-sharing scheme and it was evident from our last trip that he needs a new seat. Cue getting drowned in research/forums/guidelines!
Our major issue is that since we don't own a car, separate isofix bases/legs and seats even bordering on "chunky" are out of the question (the rental cars can be as small as a Renault Twingo/Fiat 500), so we'd be looking for one that fits with a belt or clips into the isofix points themselves.
I've read a lot online about the rear/forward-facing debate (and, frankly, got a bit scared - our in-laws back in Blighty have a Britax Evolve, which is forward-facing only, but he loved it last time we were home). I think I would like to get a rear-facing one, but am worried about compatibility and also comfort given the car situation. If he's going to scream and writhe the entirety of each and every journey (which is what he did last time) because he's cramped or because he doesn't travel in cars enough to get used to it (we will be driving more but nothing approaching regularly), that's going to make the journey more dangerous because I'll be distracted and stressed.
In an ideal world, I'd like to find a rear-facing seat that will go both ways if it turns out rear-facing proves impossible, as well as being lightweight/compact and simple to install and plonk him in it in different cars.
Does such a Goldilocks seat exist?! I like the look of the Axkid seats (although very pricey!!). I've also heard good things about the Britax Evolvafix, which seems to be the new version of the Evolve, but like its predecessor it's forward-facing only.
My biggest problem is that I have pretty much no choice but to buy "blind", and it's a lot of money to spend on something that he might just not take to, so any advice would be really welcome.
Thanks a lot in advance!