Someone wanted to talk about
Mario Kart Stadium so here we go !
There are 4 noticeable grass/sand cutters on this track. The first turn is obvious, and the ramp one is very likely as useless as the one on Luigi Circuit in MKWii, so I'm not gonna talk about those.

This corner is quite similar to the one in Retro Mario Circuit 2 (MK7).
There may be a possibility to cut this corner without a shroom, however the band of offroad is significantly bigger than in the aforementioned track, so for it to work at all, we'd need at least :
1. A red min-turbo, which in that case would have to be setup beforehand (time loss that the shroomless SC would have to compensate for to be worth it. Also means inward-drifting bikes are obviously a no-go.
2. A vehicle with a decent offroad/grip as to not go wide upon exiting the cut. This would likely pass by a speed trade-off, like using the Monster wheels
From my impression, it doesn't seem worth it because of requirement #2, but it should at least be attempted

Here's the most interesting part of the track. The last turn seems to be the best shroomspot of the track, by landing on the sand near the pipe and shrooming immediately (bikes may make this SC a bit easier.
However, there may be a method to at least clear a decent part of it shroomless : there's this ramp on the right conveniently placed, that could extent the flight long enough to pass most of the turn. Maybe you could even go in hardcore mode and land on top of a pipe in order to turn even more of the turn !
If this shroomless cut is actually possible, then we could move the shroomspot either to the hairpin cut or the first turn, whichever saves more time. But once again I wouldn't bet too much on it, from what i've heard the gliders handle worse than in MK7...