high power euro 2 pin / USB plug recommendations

Not sure if it’s what you’re looking for but I bought a Minix 65W GaN charger with US, UK and Euro plugs from Amazon that I’ve been happy with so far.

I actually tried to buy a similar uGreen one from Amazon.fr as it had a euro plug whereas the ones on Amazon.co.uk only had uk plugs, but I was unable to do so without enrolling for a “test” of Prime, so I gave up.

You've not defined 'high power' - Anker sell a charger than will deliver 140w to a single USB C port.

but I've now got one of these for travel

Anker 543 - 2xUSBA 2xUSBC 65W

I've stayed in enough places where the 2 pin euro or US sockets are knackered enough that the charger won't stay in them.  This has a figure 8 cable and I've got a Euro cable that came with a DVD player (have a spare if you want one) that I take with me.  Charger can sit on the floor or table. Charge all our devices at once. packs well because it's 'flat. Less bulky than UK plug and adaptor.  Can use it in UK as well as away.

I use this, has not let me down, has two fast ports, 2 regular, and a 3 pin plus to use at home

https://www.amazon.co.uk/gp/product/B01MXXOQTE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've got one of these

https://www.mobilefun.co.uk/olixar-65w-gan-dual-usb-c-usb-a-super-fast-pd-international-mains-charger-85220
Swappable pins for US/EU/UK.

I've no idea if the one above is any good but there are lots of warnings about safety/quality of unknown brands of charger. They're cheap enough that it feels worth sticking to the known brands

Whichever Anker has the right USB socket (A/C/other). I suspect there are lots of counterfeit products out there so buy from a reputable source, preferably one that recognises its tax obligations from a societal (not shareholder) point of view.

+1 on Anker.
I found one in a hotel a year ago - I think it's 65w. Just. Works.

They’re cheap enough that it feels worth sticking to the known brands

True but not so easy to find with Euro plug. As someone suggested, one with a short “figure 8” lead is a good compromise.

I’ve no idea if the one above is any good

It feels like a quality product, and it was packaged like a quality product. But you are right, there are risks, but the thing I was really looking for was the swappable pins and Anker don't do one of those. I do have an Anker with four outputs and a figure-8 lead, but it's a bit big and heavy.