Hi Robert, thanks for responding. The question is no longer relevant as there is a simpler solution: a SQL server database acting as a cross-org EMPI which will be kept up to date by ADT.

André-Claude, thank you very much, that would be a great starting point.  I will message you. 

If you have code that you are willing to share with the community, it's worth considering putting it into a public repo on Github.

OK, I just noticed the date after I'd posted the reply. 

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