Disregarding the fact that the "cupboard" is very small, which severely limits my track plan options, the one big issue about my current track plan are the tight curves leading in and out of staging. I need something close to 20 cm (less than 8") radius curves and turnouts more or less at the same spot.
But I think I have found the solution: Mini-Trix R1/R2 curved turnouts. Very unrealistic, but as said before, they will not be visible and ought to do the trick.
Since these turnouts, and the tight curves, are crucial to the whole track plan I have ordered 2 left-hand and 2 right-hand turnouts. Just to get them early and avoid any late surprises.