I have smallest, $1/mo + VAT Racknerd VPS for exactly this purpose. Even latency from Europe is not so bad at ~130 ms. Didn’t find anything comperable in price in EU. https://lowendbox.com/blog/new-vps-specials-by-racknerd-kvm-vps-in-multiple-locations-from-10-96-year/

I’m in the same boat, so I had set up Syncthing more like centralised service - installed one instance on my home server, and made every other device sync only with it. Files propagates without issues.