Reposting based on a signal sounds like the best idea.

Because we kinda have the alternative in place: lemmit chose the way of replicating reddit posts onto a committed instance. That means that someone still has to manually go, look at - for example the F1 - lemmit, choose an interesting post there and cross-post it to the relevant lemmy community.

If the repost into a relevant lemmy community happened automatically based on a signal, that would take off work from users.

Could that signal be the number of interactions in activitypub for a sportsbots post? Or would it be the Twitter interactions?