Maybe a TA Cyclotourist crank will resolve the issues with the swaged arm fitting
less than solidly with the OEM Stronglight stuff. ..
since the TA arm bolts (5) to the outer.. inner bolts (6) to the outer.
they do make chainrings, in France, from 26t upward.
the arm have not been made in a few years, copies are around.

I'm using a Mountain drive and the 54-15 on the AW3, ratios can be replicated
with a 13 & a 47, as an inner , and the 54 as an outer
not sure how 2 chainrings
will stack on the MD spider , the spacer is = to a chainring thickness ,
trouser guard shifting out side the spider does not double the space, as it
is half the thickness of the chainring .. so not enough total length
of distance between the inner chainring and the inside face of the crankarm..