I did try. PSET64 seems to work between TCC, elevated or not, and any arbitrary 64-bit process (though I didn't check EVERY 64-bit process I have running).
@PSET causes _whatever_ 64-bit target process you name to crash. I started a TCC from explorer and did
and EXPLORER crashed.
The error message was
Code:
TCC: (Sys) Only part of a ReadProcessMemory or WriteProcessMemory request was completed.
@Pset[%_ppid] (no 2nd argument) worked, though.