FYI: I bought and tried STLINK-V3MINIE:
IT WORKS
When you need a debugger on Portenta H7, coming with a cable (no need to solder) - this STLINK-V3MINIE is not 100 percent pin compatible with Portenta H7 debug header - but possible to make it work.
Just:
offset the STLINK-V3MINIE female header by one row!
(see drawing)
Here, how the headers look like - see that it needs to "shift" the female cable header by one row.
The SWD works, including SWO for ITM prints. Just the debugger VCP is not usable. (OK)