Correct on all counts, the whole header is used by the PiTFT board and while it provides a supplementary header to utilise the unused pins there is very little space between the two boards to fit any wires so I’d need an IDC cable and a breadboard, too messy!
In any case that’s exactly the answer I was hoping for, I’m quite new to Blynk as well so I appreciate the help from others in the community.
For some context, this is to trigger a relay (Powerswitch Tail) that is already automated by a python script but I want a simple on/off button widget on my phone as well.