There is not way to specify a "prior action" as you wish. The "previous" button on the remote is "previous chapter" (not previous timeline) and rewinding has the same limitation.
Encore does not provide "scripting" which might be able to achieve what you want.
The only ordinary way to do this is to have a single timeline.
While it provides no advantage (or disadvantage) for your current issue, the alternative for linking from one timeline to this next is to use a "playlist."