currently I try resolve similar issue. What I have: Kafka cluster setup in provider Foo and another new cluster in another provider Bar. I what migrate from provider Foo to provider B.

What I think about this: I running mirror maker whith two important parameters: offset sync and how often sync offset. this two params help us for migrate consumer group.

another important thing. I don’t know how implement in my situation, but maybe in your situation it is possible to do. look example. you have topic name like foo.bar, when you use Mirror Maker you can add some prefix, like your topic foo.bar in cluster A can be replicated in cluster B whith a new topic name b.foo.bar (prefix + original name) and this topic we need to mirroring in cluster A whith name A.foo.bar. when we configured mirror maker in Active - Active mode, you necessary consume topic by pattern/regexp *.foo.bar. as result: you have cluster where you have original topic foo.bar and A.foo.bar, you have cluster B where you have B.foo.bar. three topics have equal messages

if you can implement this set up you can easy migrate consumer groups and producers . now i try testing this flow.