The Plus One chip has the Natl Semi wavy lines logo, so it's likely a custom or one of their CPUs, possibly simplified.

I've decapped the Sharp SM-510 from the Top Gun handheld LCD game and the Sharp SM-511 from the TMNT LCD game, and I know how to reorder the physical bits into execution order. So if the lockout chips are the same family, I should be able to read them visually.

If they aren't, and are a newer process that's significantly smaller, I may not be able to do anything useful with them. For instance, the bits on the Stop Thief die are about 11.5um by 8um, which is huge, and easy to read. Ten times smaller would be pretty tough for my setup. Also, if it uses implant ROM, my simple experiments with staining haven't successfully revealed those bits.