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Throw the Weber over a hedge and fit a decent single SU - a 1 and3/4 inch would do fine
don't mess about with twins!
As far as fuel efficiency is concerned the old 1275 A series is an incredibly efficient unit, I don't think any of the modern engines get anywhere near the same thermal efficiency so replacing it with a Honda will give more power but worse MPG
The biggest efficiency improvement would be a higher final drive - mini's used to have a 3.44:1 final drive but you could buy a 2.9:1 - that makes a BIG difference to mpg
Three decades ago I had a 1275 bored and stroked to 1425cc in a mini with a soft top - that was a fun car!
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