I certainly intend to go the two cylinder route on my +4, I converted my TR4 in a similar way some time ago and it has worked very well as well as being 'period'.

If the link works, here is the Mulfab solution

http://www.mulfab.co.uk/our-products/32/...edal-assemblies



Malcolm T
1966 +4
1957 TR3
1963 TR4
1983 LR 110
1985 Robin Hood 2.0l