There is a bug with this not working for Grom the Paunch. Steps for reproduction:

Activate only this mod and the console command mod. Start a Skarsnik campaign.

Use "fow off" in console command mod to turn off fog of war. Go to Grom's start position. Use "kill" on his starting army and "abandon" on his starting settlement. End the turn.

There is no prompt to recruit him on the following turn.

Repeat the same with Wurrzag. You DO get a prompt to recruit him.

Yes, I do have the Warden and the Paunch DLC. I originally discovered this problem when I failed to recruit Grom in a normal campaign, so this is not something specific with console commands.