Why should I have to execute data?

The Von Neumann architecture sounded good in the beginning when computers were hulking beasts and had to be timeshared to be economical. Scaling this to individual global-Internet-connected network PCs provided to be a disaster as is evidenced by all the "expert C programmers" over the years that couldn't keep their buffer overflows in their pants and things like NX support in CPUs and pointer authentication that just wouldn't have to exist if the CPU would get instructions from a 100% separate address space than its data (kinda like that old 8051 that's still kicking).

This is a terrible idea. Sorry.