Hi,
I have a question, when you delete a clip in Vegas, the keyframes are removed too. Are you able to make a setting or something so that the keyframes doesn't get removed?
If you are wanting to "delete" a clip and then replace it with another clip....using the same keys you have already set....go to the Media Pool, right-click on the clip you would like to delete....choose replace....and browse to the clip you would like to substitue in it's place. This will replace the clip in the media pool and on the timelime without effecting your previous keys.
If you are wanting to keep the keys for use in other projects, then just save the .veg file and treat it like a template with the above procedures.