Some PCs are able to use your own keys, which can be used to sign your bootloader. This has worked well for me with various HP computers (EliteBooks and EliteDesks). One of those, which only runs Linux, will refuse to boot the Windows installer. On my work laptop, I've also added the Windows key (not the 3rd party one) so I can dual-boot.

I understand some computers may not support this as well, so YMMV.