You could go for the 8600G/8700G APUs without a graphics card. This should give you better performance than the Steam Deck and the option to later add a graphics card.
I’ve added a screenshot of a german shop that sells these for 649€ without operating system:
I did not find any pre-built PCs with this CPU, that’s why I’m referring to this shop that does the assembly for the customer.
Yes, that is why many big tech companies have their european hq there.
Edit: Wikipedia on Ireland as a tax haven