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From the same thread from weight weenies:
Space could be tight.
Flattening your own spokes does not sound that difficult:
For example, it looks like the flattening isn't quite 2 mm across (the flats aren't quite even with the spoke diameter). Possibly it's around 3 mm or so. I would measuring to confirm, then maybe tape two 3 mm allen keys (or some other hard things which are the right thickness) in my vice and flatten each spoke head, with the allen keys functioning as a repeatable spacer or tooling stop.
So just squash them a bit in a vice...
https://weightweenies.starbike.com/forum/viewtopic.php?t=150872#p1389190
svenhöek-
Not entirely sure that I'd trust myself to do this effectively, but I have a friend with a good mechanical mind, bike building experience & all manners of tools. Going to buy some wheels I can feel confident on for an upcoming tour (two weeks in the Italian/Swiss Alps!) in September, & then butcher the wheels & see what we can do later in the year.
GideonPARANOID
The Shimano spokes are proprietary with flattened spoke heads, but I've been playing with some old C35 hubs and some straight pull CX-Ray spokes and they seem to fit fine. I can see that the flattened heads would be useful when you're building them in a production environment, as it'll stop the spokes twisting when you're building them up, but at the moment I can't see any reason why CX-Ray straight pull spokes shouldn't work. Haven't got round to actually using them in a new wheelset though, although I do have the rims I need to reuse them.