We have a number of mailing lists, some of which are synchronised with mailchimp lists with emails sent via mailchimp (organisational culture means that they want to keep these with mailchimp). The others are sent via CiviMail.
We've created a manage my subscriptions page that contains all mailing list subscriptions. We can provide a checksummed link to this page from CiviCRM mailings I am struggling to see how we could create this from mailchimp. One thing we can do is create links in mailchimp of the form firstname.lastname@example.org. And have this URL trigger an email to the recipient that authenticates them to example.org/link-to-manage-my-subscriptions.
I'm wondering if I am missing a trick that would allow us to create a checksum link in mailchimp and authenticate to that page without the extra email step.