I am going 1x9 and am not clear if a need to replace the granny with an inner plate or just remove it and use a thin outer plate mounted inside.

Replace granny with Blackspire Blackguard looks like it would work but I think it may be larger than my actual bash guard (32t)

Option 2 would be a thin chain guard from Salsa but it would be mounted to the same bolts as my bash and 32t ring but on the inside as it will not fit the smaller bolt pattern of the granny.