Adapting ordinary sockets to hex keys.

[zerodish]

The whole idea here is to make a light weight tool set to take on tours. Useful sockets are 8 9 10 12 and 14mm. What you will need is a 1/4 inch square piece of metal. I found one in the road which was a key to a shaft. You may need to make one. You could grind down a 1/4 inch hex key or perhaps a 1/4 inch screwdriver bit. https://flic.kr/p/2moPbGZ

[Old Guy New Hobby]

The only roadside socket I need is 13 mm. This might not be the best idea if you need all those sizes, but it works for me.
https://smile.amazon.com/gp/product/B000HBAI5E/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

[canalligators]

I suppose it all depends on your bike and accessories, but I find little use for sockets on tour.  Most of the fasteners are allen head, for which I take a small multi-tool.  What few hex head bolts & nuts I have, can be managed with a 4” crescent wrench.

The important point is to make sure you can work all fasteners on your rig, and you can effect the common repairs: tire repair, chain link replacement, cable replacement, spoke replacement.