I recently gave Bubbles the royal boot after she said she was moving TWICE and then said she changed her mind (the third time she gave me notice is when she actually budged). I don't remember how long I had her for but IT WAS AWHILE and I hated it so bad.
I have been TTing forward a day, going in and walking around, and then going back a day, going in and walking around, rinse and repeat, and I finally managed to get pinged by her. I find that doing this days technically DO pass so you'll probably get pinged quite a bit depending on how long you've been going for. Once Bubbles pinged me and decided to go, I just kept going day by day until she went into boxes and left. Rejoiced a lot! :3
I had to talk to Bubbles sometimes throughout the time I had her but I eventually got rid of her by doing this. I CAN'T guarantee that this will work for you, but this would be 2 villagers now that I got out with this method I discovered, so I thought to mention it.
Also, have you maybe tried talking to him recently? He might not ping you if you haven't talked in awhile to him. I'm no expert, buuut... just thought to consider it. *shrugs*
As for the Ignoring Trick, tbh that never worked for me either, so... =/
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Is Elmer just not pinging you or is NO ONE pinging you? Has anyone asked to move?