Four or five speed transmisson converstion

Was wondering if anyone on here has thought about a conversion from automatic to a standard transmission and what options are out there to make that possible. I know the old 4.2 engines could be converted to a borg-warner five speed or some such, but have not seen anything on conversions for the newer cars.

Footnote to above. My understanding is that some of the later Astons were available with a 5 or 6 speed and the companies were ‘sisters’ while Ford ran them.
Is there some sort of a cross breed opportunity here?

Probably but you are getting into a whole area of pain as you are going to need to source elcktrikery boxes as well.