The 6 point bit is slightly irrelevant. I use a boggo 12 point/bi hex, ground down so there’s no bevel on the lip of the socket. Works lovely. The top caps aren’t done up tight, so you don’t need much leverage.
Bought a std 6 point socket (draper i think) and carefully ground it down so it has a flat rather than bevelled edge. The main reason for the flat surface is to ensure the socket grips the fork as much as possible, reducing the change of rounding the head of the part.
You’ll be lucky to find a 26mm on the shelf, its a bit of an odd size!