Those siwash hooks are useless , use sickle hooks , or trebels.No idea what's available these days, but interested to follow this. Used to fish a lot of spinners for coho. "Old timer" status is officially awarded to anyone who remembers Metric and Bolo spinners being standard in the 70's.
Some gray dirtbag/fly area I like with spinners, besides similarities in presentation tactics, is customizing hooks with fly tying. Nothing new with that since Rooster Tails have been around. And more recently with hootchie spinners. Last time I fished a spinner was a Blue Fox from my found lure collection. Changed out the treble with a hootchie fly and got a fat chromer late run on it.
Come to think of it, custom lure mods could be a common ground topic with real potential for fly and gear idea sharing.