Have you heard of Hi-loks? They're aircraft fasteners, basically a bolt with the hex on the end of the shank rather than in the head. Their usual application is with a nut-like collar, you hold the pin from moving with an allen key and wrench the driving part of the collar off to set the pre-load consistently.
Anyway, the point is, they might have part number for a pin substantially similar to what you're making there, ready to use out of the wrapper.
Jim
No time to do it right, plenty of time to do it twice.