Hi @Michael_Soprano ,
I think that should be doable. Depending on the exact use case the challenge would be that the rawbox don't have the visitor id/details and Target won't be able to recognize the hit as a returning user. You should be able to work around that using mboxThirdPartyId: https://experienceleague.adobe.com/en/docs/target/using/audiences/visitor-profiles/3rd-party-id
Let me know how it goes.