Alder models made some fine looking operational switch stands in HO and O. They were bought out by www.surreycustommodels.com a few years ago. Unfortunately SCM is on hiatus, so things aren't readily available.
Try here: http://www.proto87stores.com/p87stores/ They make a nice looking HO switch machine in plastic that's operational. I think you can but I am not for sure if you can order just the detail kit rather than an entire switch. they even have prototype throw bars too!