(I love your avatar, BTW)
You've been told right - desktop Monarch/Modeler has never been able to write out to OLEdb. DataPump/Automator can do this, by editing the project export.
However, with 12.2, I think you're in the version where it can work from desktop XPRJ or DPRJ files edited with Monarch/Modeler, but you can't edit the exports unless you upload the projects for the process into the Digital Object Repository.
Once they're in there, defining OLEdb exports should be OK.
There's a forum here for Automator admins, managed by Pat Wall, the Community Manager, and Rami Chahine, who's in charge of the development of Automator, and I'm sure they'd be both glad to reach out to you to invite you to join that forum, and to give you some direct help with the Digital Object Repository.
There is a new version of Automator coming, I believe, in a month or so, that will make managing projects and exports a lot easier.