sorry, the ProII SS hub uses a different axle and end caps to the normal QR 10mm hub
the SS axle is “blanked” at the ends instead of having axle stubs for dropouts, and has a much larger diameter threading for the screw-in bolts, the frame dropouts sit on these bolts directly
Let’s try this again..
Hope Pro2 SS hub uses the same replaceable end caps as the normal Pro2, so you just buy the QR end caps [which have the 10mm ‘stub’ for your dropout] and pop them on in place of the bolt-on caps [which are blank on the end so your dropouts sit on the bolts, which you have also removed!].
You dont replace the axle (the Pro2-SS is a specific axle) just swap the endcaps.
Then ends of the axle are threaded, but are the same internal diameter as the normal QR hope axle, the only special thing about the QR axle is it has a narrow section in the middle to help guide your skewer through. At no point (in any hub) is a 5mm QR taking any load other than tension when doing it up. The axle (or end caps in this case) take the load
I know this works, I have had this exact setup on my bike over 6months.