I think Ken is referring to the type that you clip to the camera viewfinders, these have zoom magnification and are designed to look through another eyepiece. They are not just a mirror.
Provided you can mount it, it should work. They are a 1-3x telescope designed to look through another optical device. Try it during the day by just holding it. Anyone who wants one can also buy them on eBay for about $60.
Wavytones idea would also work fine. For best results you need an adjustable mount for the finder that can be locked off tight and immovable and something like two flat milled plates one attached to the mount, one to the finder, with 3 dowel pins as precise locators to precisely relocate the finder each time.
Regards
Joe
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