I would have her first four-issue arc be about dealing with her return and with the X-Men. She gets caught up on the status quo, she hugs, cries and punches a few fellow mutants. Maybe the Juggernaut shows up and she single-handedly defeats him WITHOUT any sign, sniff or even passing hint of the Phoenix. And then she leaves the X universe.
No Mr. Sinister lurking around the corner, no Mastermind or Shadow King in the mirror. No More X-Universe.
Who would be an awesome character to pair up in a Hard Traveling Heroes themed arc (issues 5-10)? I am leaning toward She-Hulk, all grey and out of sorts. Oe maybe Captain Monica....minus Blue Marvel...with the exception of a few cameos. Somehow they are drawn together.
Better yet, maybe her new pal and potential traveling companion is Zemo.
Maybe they have a weird connection....working arrangement with each other. They meet and she's like, "I don't work with Nazi blood" and remarks under his sock and replies "I don't work with planet eaters". Both want to fix the world but in different ways than before, no ties to the past for either. It's like the Thunderbolts for two. And they somehow explain away Zemo's out of character behavior for the last 4-6 years too.
I would have some weird circumstance and have her linked to the ghost of Rick Jones...like Rick and Capt. Marvels....just for an arc before Rick is saved (STILL NO PHOENIX, NEVER ANY PHOENIX!!)
And throughout the Rick arc, you have her teasing her about all the stupid things the X-Men have done over the last 13 years since she was dead.
If we can't have Reed and Sue, maybe we have Jean and Namor? A post below convinced me that Namor and Jean could be an amazing couple. Although they have no real shared history, he was a recent host of the Phoenix, just like her. Although I REALLY hope we won't have any more Phoenix stories.
So Jean, Namor, Johnny and Ben? Could be kind of great, in my opinion.
I think writers are reviving her to breath life back into the X-Men franchise, but Jean never thrived in the X-Men. The best thing for the character is to get her away from that toxic swamp. Her first story should be a metaphorical road trip, getting her accustomed to the current state of the Grey family (so sad), the Avengers, Inhumans, X-Men, etc before deciding to make the Baxter Building her home.