I have been looking at gear selection mechanisms.
Heres an idea taken from the smartcar.
I reckon it wouldnt be that difficult to apply this idea with a 3 way switch and some simple electronics linked to the RPM sensor of a ECU and linked to the clutch arm on the A series, enabling a tiptronic style gearchange.
Food for thoughts (ignore the markings, they are someone elses).
http://www.smartmaniacs.co.uk/forums/showthread.php?t=45563
linked to this:
http://www.jackknight.co.uk/press_release/0808_JKD%20-%20Sequential%20Gear%20shift%20Press%20release.pdf