I was on a business trip to Helsinki Finland last week and could not help you but I think @mfgrep and @pete H have contributed with a lot of valuable advice.
My solution was as follows. I share the link of the product I bought from Aliexpress. Both products are very high quality, I recommend.
Just found this amazing item on AliExpress. Check it out! £2.44 27% Off | ZTTO High-Strength Bicycle Stem Gopro Mount Lightweight CNC Holder Universal adapter for XC AM MTB Mountain bike Road Bike
Just found this amazing item on AliExpress. Check it out! £7.12 17% Off | Aluminium Alloy 360 Degree Rotating Joint Adapter Mount for Gopro Hero 12 11 10 Max XiaoYi SJCAM SJ4000 Action Camera Accessory