I think tribes should either function as a normal nation OR have their own unique way to manage armies.
By trying to mix their tribe leader old system with levy system you get situations where you get way too many small levies that cannot be combined together.
In general levies not combining is a problem in itself but I leave that for another thread.
I suggest tribes to not be able to raise levies at all. Instead each tribe leader will get his/her own permanent legion. These legions will have a size that will not depend on a single region like traditional legions, instead they will be based on your overall population (more or less the sum of your normal levies from all regions divided by the number of tribes).
You could then modify your rulers legion but not modify or disband other leaders legions
By trying to mix their tribe leader old system with levy system you get situations where you get way too many small levies that cannot be combined together.
In general levies not combining is a problem in itself but I leave that for another thread.
I suggest tribes to not be able to raise levies at all. Instead each tribe leader will get his/her own permanent legion. These legions will have a size that will not depend on a single region like traditional legions, instead they will be based on your overall population (more or less the sum of your normal levies from all regions divided by the number of tribes).
You could then modify your rulers legion but not modify or disband other leaders legions
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