Creating an RVIZ plugin to add semantic information to a map

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I repeat this question posted 2 years ago, except that we need a plugin for a different purpose. We plan to create a graphical editor to add semantic information to 2D/3D maps, and a RViz plugin could be the ideal solution. Rqt plugins look great for simple interfaces, but we need the fully-fledged 3D interface that RViz provides. So it's still not recommended to make a RViz plugins?

I already started a plugin, reusing rqt_nav_view to load a 2D map, but I'm afraid that make it fully 3D will be a lot of development effort, and I don't have enough time.

Thanks for any input!