I wrote a tool that could be used like that but it's useless if its not ubiquitous (https://github.com/mmikulicic/runck)
At any rate - code-signing doesn't really help if the author is the attacker.
Anyway, the use case for my runck utility is scripts such as dockefiles or CI automation where I want to download and run installers and I don't want to reduce the bash boilerplate.