Good luck with the search Raphaelle. I put it out on Twitter (with the link to this post). You may want to add a way for people to contact you directly if they’re interested?
This reminds me that there was a discussion at the TAG of creating some kind of repository/roster of IATI resources/experts. Consensus was that the easiest way to have an always up-to-date list would be for people with IATI expertise to self-identify as such on LinkedIn. I wonder if anyone actually did it? Perhaps worth checking.