I have a 2018 E350 camper, but the dash setup looks identical to yours. It's way way easier to get back there and deal with the electrical stuff if you drop the steering column after removing the kick panel.
I've got a 2019 e-350 FedEx truck that I'm about to try this on, but I have to get home and get it done before work the next day. I'm not sure if you mentioned what year yours is and I can't find info on the newer generations. Is yours a 19? It looks the same but I wanna be sure first.