Re: does anyone else use some in this manner
We're talking specifically about "some" modifying an adjective, right?
This feels familiar to me, perhaps after 15 years of living in Maine, which is really just a Canadian Maritime province that happens to be attached to the United States.
I don't think I use it that way, yet I wouldn't react to hearing it. Things like "Those roses you gave her made her some happy, I tell you!" sound natural enough.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.