I've made a few watch tools which are available on my thingiverse here.
Simple design movement holders which I like as they're easy to make in online cad software to whatever size you require and hold the movements firmly and no risk of marking them or other damage.
I've just measured some of the generic shepherds crook springs that you can get from Cousins: https://www.cousinsuk.com/product/shepherds-hook-springs-wristwatch
Whilst these of course aren't click springs, they do come in a variety of widths ... including the 0.15mm you need. They're also quite large so should give enough material to perhaps adapt / shape for the click spring you need. They're also inexpensive so might be worth a punt if you come up blank through other routes. Just an idea...
Yes the loose pin is a guide pin from a bridge, but from which you have to find out your self.
I'm still pussled about that tube in the jewel, how is it supposed the lubrication comes on to the wheel pivot from the oil cup?