One solution is to find a car radiator hose of the right bore size with two right angle bends, cut the middle section short to suit and join with a small length of steel pipe and two jubilee clips. As you say, the thing is almost invisible.
For the record, I think I found out the air cleaner was an option from 1952 but none too common with the introduction of the SU carb making it redundant in 1954.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.