the desire for it is popular but the implentation for it has not had much luck over the years.
none of the old MODs that did it will work with 3.1 or above.
the only decent one I know of that works is called BridgeDD but the version that works with 3.1 and above is not free.
If it was me I would just install them separately and let the few that wanted to use both to simply register for both. it would only be a one time thing and the they would be automatically logged in to either one or both when they visited as long as they set it up for that.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
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I am pleased to announce that I have completed the first item on my bucket list. I have the bucket.