How can my wii work in Europe?

The big issue isn’t analog 50/60Hz incompatibilities - it’s what region the Wii you have is locked to more so then anything else. If you want to make it region free, a modchip that attaches to the optical drive (or a softmod) is required. I am not going to link to anything that can be used to do it here (unless it’s absolutely necessary) but it isn’t hard to find a 100% compatible modchip or a known good softmod. Check eBay for a physical modchip if you want to leave the software stock and not risk it there. My only recommendation is to find a GC compatible Wii if you’re going to go through the trouble of modifying it at the physical level and pick up some component cables.

I wish I could link some parts, but in the US modchips are legally grey at best - they aren’t 100% illegal per say BUT if you use it for piracy then you’re breaking the law.

Beyond that, you will just need to see. Since the region locking is more of a defeatable software design flaw, I’m not as concerned about that. What I AM concerned about is if the Wii is designed to handle 50/60Hz on a single board (with software based region locking) or if it’s like 90’s composite consoles where the PAL consoles need a 50->60Hz adapter. PAL regioned consoles are usually 50Hz and US/Cananda uses 60Hz as a general rule - beyond that, I don’t have a clear answer on what will need to be converted to (or from).