The absolute best Europe could do would be to get machines running a RISC-V architecture running Linux in production and distribution. RISC-V was developed at UC Berkley, GNU at Harvard based on UNIX from Bell Labs and the Linux kernel by a Finnish-American named Torvalds. ARM is probably closer to production ready than RISC-V but you'll have to pay licenses to England and Japan for it.
Oh, and that's all desktop and server stuff. You've got an even deeper ditch to dig to get anything mobile that isn't based on Apple or Google tech. Not even Microsoft managed that.
Even if you did get that done, which you won't, you will have built "European digital sovereignty" upon the crumbs that fell off of America's dinner table. The 21st century was invented in Britain and built by the United States out of parts manufactured in Southeast Asia while Europe masturbated. And this was perfectly acceptable until this year, with the election of Tariff McBlusterCuck. Now you're gonna do it on your own.
Sure.