In fact I am already doing that with TaigaChat. I have just hidden all things that are relate to accounts or forums.
But there is not much of a problem if I need to delete the entire install and start over.
Now, I am thinking if it would be incredibly stupid to replace Photopost Pro with XFMG?
For this to work I would need to do an incremental import of forum accounts without any forum node imports. (retain ID's) After the initial forum account import I would import PP to XFMG. Then later when I migrate the vb forum overwrite the accounts with new data and import the forums while retaining ID's. Could this approach work or is this just asking for trouble?