afaik the Vigna di Valle G.55 (actually a "retrofitted" G.59 fuselage) had the cockpit painted in this way because of both reminescences of builders of the time and because a recovered wreckage showed this color on the inside. Bear in mind though that I might remember wrong

Btw one really important thing that most of us undervalue is that especially after 1943 the urge for spare parts and combat ready airplanes led to interesting customizations. Some days ago I was talking to a friend of mine who told me there are references and pictures of Macchi 205s used by the ANR which sported REVI gunsights instead of the S. Giorgio OMI standard issue. The absolute certainty about details like the interior paints etc.. will always be mutuated by field modifications.
Let's make an example: macchi 205s were made by both macchi and breda, and a typical difference was the interiors color, one in verde anticorrosione and the other in black. Let's say a breda exemplar received some battle damage and needed a spare canopy, the ground chiefs might have used the macchi one and you would have had the cockpit in one color and the inner canopy frame in another!
I do believe that sometimes accuracy should leave some room for imagination and "artistic sense", even with model kits
Cheers!
Alex