I'd keep the existing 640-1 as is, then buy a 640 Pro before the rebate expires:
https://grabagun.com/s-w-640-pro-2-1...s-moon-ns.html
I actually used to have a 640-1 which needed work, sold it, then bought a 640 Pro. The existing trigger is fine and also has the ability to use moon-clips. The added benefit of buying a 640 Pro is it can be had right now, with no indefinite time period to search for; ship; and wait for the work to be done at a yet-to-be-determined price.
If the first 640-1 didn't need work, I'd have kept it, but a friend wanted it and didn't mind it the way it was (it had to closed by specifically pressing on the yoke vs. the cylinder, otherwise it worked fine).
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