Welcome Joseph!
I recommend to join us at
https://librecad.zulipchat.com/.
There you will find Florian, who is the one you need for LibreCAD 3 support.
By chance, do you already have some more detailed plans or mockups about your project?
Basically I advocate Ries' recommendation to go with LibreCAD 3, it is exactly intended for this kind of usage.
Where I have doubts is your target of Sept. '22. I'm not sure if LibreCAD 3 is in a state then where it can fulfill your requirements. On the other hand my plan for LibreCAD 2 is a final release soon and then focus on V3 too. So I'm not sure if it makes sense to put in efforts in interfacing with V2. Where I expect much more work with V2 implementation than V3.
Armin
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