Yes, doc, the "et" pronunciation was current in my home, "when I were a lad."
So far as memory serves, it was used only for the third person, sing. or plur.. One would say, "I ate all my greens, Mum!" but, "The cat et the fish you left on the table."
My home was Middlesex (now the western part of Greater London), but my mother came from Buckinghamshire, whence the pronunciation emanated, I guess. I found it was common parlance in Northamptonshire when I lived there in later life. Northants and Bucks have very similar accents and dialects.
Me Pa were born in Gloucestershire, but 'ad been brung up in Bucks, so 'e talked the same as me Ma.