Some answers:
Lean-SS is a separate issue ,can be integrated with both levels.
SPC is part of both levels.
YB is just an introdiction to SS (1-2 days only)
5 days is fair enough for the YB/GB level.
RC is a basic part of SS.
Main differences between BB & GB are :DOE,ANOVA,Probability,Testing for statistically signifi change using variable/proportional data & Non-normal distribution,Linear transfer function,etc.
An intensive BB course for one week is fair enough.
A trained experienced BB can perform those courses successfully.
Suggest to go for the levels of SS rather than the belt levels
The best candidates for those courses chould be engineers or those technical persons with statistical background,specially for the BB level.
Hope that helps
good luck