The mini its going in is early 70s so it never left the factory with one.
You want to ditch the lovely Mk3 steering column shroud with it's Lowe & Fletcher lock (or rarer Neiman-Tex lock)? .... may the fleas of a thousand camels inhabit your arm-pits !
It is possible to fit the MPI switch-gear within the Mk3 shroud (& retain the side facing lock) but it takes a lot of time & effort, & by that i mean A LOT! I can't remember how long it took me but it's not something to undertake lightly.
It might be easier to fit MK4 switch-gear into a Mk3 shroud but i haven't tried that (you will need to cut/file/polish the plastic shroud where the L/H arm comes out).
For anyone else wanting MPI switch-gear it was also fitted to some of the Rover & MG range of that era (with the added bonus that some had a rear wash/wipe switch included in the R/H arm -they are interchangeable). The same applies to steering wheels -many of them will fit (esp the MGF/MGTF) but make sure you get one with an airbag if the centre section is a different shape.
(NB: I take no responsibility for any numpty buying the wrong part!)