Lead free is also know as 95/5 (Tin + Antimony) There is also lead free silver solder, but that stuff is STUPID expensive.

https://www.amazon.com/Canfield-85311-Safe-Lead-Free-Solder/dp/B00MTXPFP6/ref=sr_1_7?dchild=1&keywords=lead-free+solder&qid=1635447823&sr=8-7 This one appears to be 97% tin and 3% copper. Your mileage may vary here.

https://www.amazon.com/dp/B005WE75YI/ref=syn_sd_onsite_desktop_160?pd_rd_plhdr=t&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzUjY4U09YTDJDMlg1JmVuY3J5cHRlZElkPUEwNjkzOTg1M0tETUxZV1NLNEdRVCZlbmNyeXB0ZWRBZElkPUEwNDAwODUzMTYxTFFBMDROV0YzSSZ3aWRnZXROYW1lPXNkX29uc2l0ZV9kZXNrdG9wJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1 This is traditional 95/5

Not sure if these will ship to EU, but at least this gives you brand names to look for, and maybe some new key words