Hi..I agree the 380mm original one is too much wide for the small space in the car...
..but for me a 350mm steering wheel is better than a "F1 style" 330mm wheel
(and also a 360mm wheel is a possibility but this diameter is rarity):
..a wider steering wheel is in practice more "precise"
both at driving the car and also at controlling steering reactions,
because the sud/33 steering system / suspension is not
as rigid, light, neutral as the one of a Lotus Esprit
On alfa 33 P4 (20% heavier than Sud but with power steering)
the optional Nardi "small/sport" wheel was 360mm.
..and 350mm should be already enough small to get more
space for legs and easier get in the car also if
you move backwards the position of the steering wheel..
..but it's only a personal opinion..