@Chris Buley Please fine below the answers inline to your questions:
Are there any plans to add other regions to Vision Studio in the near future?
Answer: Currently there is no plan to add new regions to the model customization feature on Vision Studio. If there are any changes or new plans, it will be added to this documentation, so that you can keep a track of it.
We recommend keep using the customvision.ai APIs:
https://learn.microsoft.com/en-us/rest/api/custom-vision/?view=rest-customvision-v3.3
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Also, at least for the V2.0 OCR Read function, could I have some references to migrate this to a later version?
Answer: This documentation talks about upgrading the READ APi from 2.0 to higher version:
https://learn.microsoft.com/en-us/azure/ai-services/computer-vision/upgrade-api-versions
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Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.
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