Your only option is a small range of Thinkpads from a decade ago that require you to open the case and pinch a chip with a special connector so you can flash LibreBoot on it. Stallman was into this and me and nostr:nprofile1qydhwumn8ghj7emvv4shxmmwv96x7u3wv3jhvtmjv4kxz7gqyzrpssgfat5n0kxklxqtfg95dkjw7rvc86k7gqlwrdxqk677yw95w6r70u3 used to run like that until we couldn't take the performance penalty anymore.