Re: What if....
...he legally changed his name as an Equidorian citizen, got a new passport, etc. and then applied for being a diplomat in his new name? That might sneak under the radar... and stand a chance of working.
I suspect that literally anyone Ecquador proposes diplmatic protection for will be invited to attend an interview at the FCO or similar prior to approval, or required to submit fingerprints and photographs. At least up until the point that the case concludes.