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You should look into the Run-As feature! Core V3 API - Run-As Feature & Signed Add-Ons
You can use it standalone (just calling the API) or as part of an Add-on. It requires setting a system property to enable, you need to be making the request as a full access admin and you need to add a header to your request.
Hope that helps,
Thanks for helping (both of you)! Super fast response