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I would try

$ neutron router-gateway-clear Router01
$ neutron router-interface-delete Router01 <interface> 
$ neutron router-delete Router01
$ neutron router-create Router02
$ neutron router-gateway-set Router02  public ( the same which was cleared by (1))
$ neutron router-gateway-add Router02 <interface> ( the same which was deleted by (2))

I would try

$ neutron router-gateway-clear Router01
$ neutron router-interface-delete Router01 <interface> 
$ neutron router-delete Router01
$ neutron router-create Router02
$ neutron router-gateway-set Router02  public ( the same which was cleared by (1))
$ neutron router-gateway-add Router02 <interface> ( the same which was deleted by (2))

Due to syntax

neutron router-gateway-set --disable-snat <Router ID> <External network ID>

It might be enough clear external gateway and set it again not touching interface to private subnet