I’m using telescopic post so it’s just replacing the stock top part with a normal post - 26.6mm diameter (or I could get the Joseph Kusoac, which is 27.2mm giving more options).
Some of the titanium aftermarket posts have built in clamps, but obviously £££.
I would be interested in seeing your solution to getting rid of the pentaclip when you do please. Hope alls good with you dude.