Result Split Brep with Curves in RhinoCommon

Dear community members,

i am trying to project a text on brep and split it. instead of projecting or pulling i found that Rhino Common command Brep split works well.
https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.brep/split

The issue is with filtering the desired surfaces. How do I filter the result so I get only the Text R ?
See image below

I am writing it in python grasshopper using rhino common

Thanks a lot

some Ideas

(1)

the “R” surface should have one inner loop - the selected surfaces not.
Brepface - Loops
LoopType
BrepLoop Type

(2)

But if you do it with “M” this approach will fail.
maybe comparing the boudingbox will be enough ?

(3)

if it is always a single Surface that is trimmed:
check the boundingbox of the
BrepLoop.To2dCurve()

hope this helps - kind regards -tom

Thank you Tom for your Answer.
It turned out the best option is to check all bounding boxes and remove the ones contained in the big one.
if bbox_L.Contains(bbox_S):
Note: I had to scale the big one a bit to ensure successful check