You can't import activities into Marketo, so I recommend using the "Delete Lead From SFDC" flow step from the Marketo side. That way it will delete the records in SFDC, but leave them in Marketo so their activity log remains intact. Then you can just sync them back to SFDC from Marketo using another smart campaign with the "Sync Lead to SFDC" flow step, and your SFDC team can update their activities there once they've synced over.
Thanks for the answer Grant, and I think that's something we may do. Will Marketo still sync over the existing records as contacts or as Leads? We need these to be Leads in SFDC, and that is the reason we are deleting the contacts.
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Marketo always posts records as SFDC Leads. You need to explicitly use Convert Lead to Contact (not recommended in Marketo).
I would be careful that you do not delete the leads in SFDC during this process. Use Marketo do so as Grant suggests.
It may be harder for the SFDC Admin to match SFDC Tasks back to Leads that get pushed over from Marketo again because they will have new SFDC IDs. Check if they can match by email address.
If they have Demand Tools they may be able to fix this in SFDC itself.