The ambrosio importers have packed up and gone. I am thinking about importing them and I might get the excelights however for now forget about having wheels with them.
I can check tomorrow if JD whiskers have any left. If they do then I can get them. However the ambrosio excelight while a decent rim is very similar to the old mavic open pro. Regardless of how light you are with a shallow narrow rim the only spoke count worth having is 32H or 36h. 28H rear risk spoke failures also when building everytime you stress the wheel it will go out of true. That not confidence inspiring when it comes to send them on there merry way.
As for other rims well for narrow and shallow there is the Mavic open pro in CD finish. this looks wonderful. But for something that looks quite classy there is the H plus son TB14 which is 14mm deep and 23mm wide. Its a nice box section rim. The archetype has already been mentioned and looks good on most older bikes.
HED do the other classy looking rim and that the belgium + but its quite expensive. It's not period either.
The Velocity A23 would work well too. the finish looks a bit cheap though but it works fine as a rim. The other modern rim that is pretty decent is the DT Swis R460. I may not be period but it does the job. The kinlins I like alot possibly wont look right on this bike so I am leaving them out.
Of course you should be having the ambrosio nemesis tubular rims but the only 32H rims I have at present have some marks. I have some 36H rims and a couple of montreals. The nemesis is a tubular rim and tubs suit the C40. I would.
The mavic open pro T is the tubular remake of the reflex. This would also work. HED do the belgium C2 and I have a pair in 24H drilling. This given the rim can be made to work well (tubular rim are stiffer than there clincher counterparts).
I even have a pair of velocity escapes and some old Mavic GP4's.
So tubular or clincher. Your probbaly not thinking tubeless.
Ah I have a couple of DT Swiss rims that would work. A 28H R415 for the front and R440 28H for the rear. DT swiss did used to make some good rims. what happened?
Heres what the grey archetypes look like. the TB14 are the same but box shape and shallower.baby of cow called
A tubular build for inspiration and the H Plus Son TB14's would look similar. baby of cow called