if it’s a lump sum it doesn’t have to come from abroad. I did the Non O based on marriage and it was a domestic transfer and all was ok. This was in Bangkok.
I collected my first ever extension of stay based on marriage to a Thai wife from Chaengwattana and they didn’t do a home visit for us either. I had no problems collecting my extension of stay. You’ll be fine mate
When I did my extension of stay, my wife asked the reception desk as you walk in for a few spare copies. They gladly handed her 3 or so of each of the required ones 🙂. Maybe you can ask when you collect you extension after the 30 day consideration