Do you really use a clasp/swivel that often when you spin fish?
Are you looking at doing this for ease of changing flies or to save tippet?
Aside from inline spinners, I almost never used one when using my bait casting and spinning gear. It was almost just as fast to tie a knot as it was to clip and unclip one of the clasps. If it was cold out, new knot always won.
The other caveat that I think is worth mentioning is durability of your tippet. When you are using smaller tippets, they tend to get nicked and frayed quite often so you may end up tying more knots than you originally thought about.
I guess my point is that I'd just stick to knots