Sync Issues based on labels with a public accessible closed project

Hi folk,

we have a internal Gitlab EE instance running that can not be reached from outside the enterprise network.
Here we gather all of our system related issues that combine our hardware+software setup.

Since we have many partner that provide our hardware+software we want to synchronize this issues with a repository on that can be accessed from external.

I found a tool that could provide this but it is not created for exactly this use case:

It misses the “only sync issues with LABEL x feature”

Do you know another tool or way how to overcome this problem? Otherwise I would add this feature to grge or create a new tool for this.