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Does such a thing even exist for people who don't have unlimited time and resources?
Not really. The closest you can come is securing your SPI BIOS flash with a secure interposer (a la Google) and eliminating as much flash as possible from the rest of the system (make sure everything is loaded at boot instead). The latter part is quite difficult to achieve 100%.
This is far more advanced than anything I've set up, and I am running a more secure chain than most people (SecureBoot and self-signed bootloader and encrypted disk). The effort required to go from that "kinda safe" state to "really really safe" is immense.
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