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isn't there any way at all to achieve this? even if it requires manual work on our side

we are mapping Kratos identities to identities in our side, so if could manage somehow to keep the relation between the transferred Kratos identity and our identity, it should work. Would Kratos allow us to access the `transfer_identifiers` from apple somehow?

From the docs it looks like you need to get the access token and use it to get the transfer identifier. I guess you then need to add it as a second Apple credential identifier to the user. Then the user should be able to log into both apps. You'll have to try if that is enough or more is needed.