Is there a way to share content amongst wordpress sites

We have a set of five health blogs which have been running for about six months. Other than using the same theme (styled slightly differently for each one), they are currently completely separate. We are now trying to figure out how best to combine them into a “network” of blogs. Note: this doesn’t have to mean WPMU, the aim is more:

How to retrieve the IDs of existing custom managed content types

I have followed these steps to create some custom managed content types for my organization. It seems like the delete request needs an ID of the record to be deleted via the tooling API, which makes sense. However, the managedContentType metadata type doesn’t support being queried with SOQL. My question is, how do I retrieve the IDs of the existing managedContentType records in the system so I can delete previous versions that should no longer be used?