Yes, that would be one approach. Maybe, as you say, the one possible approach.
I think I assumed back when I was first thinking about it that OWH had originally been going to be SW solo-walking in sober meditation about how TW was definitely, actually dying this time, honest, and how, despite it sounding counter-intuitive, she was going to have to leave him at home and walk alone, in winter, as a way of getting used to the solitary winter of what her life would be like without him by her side, gathering strength before rushing home to tend him through his last days. A sort of pre-emptive meditation on widowhood.
(Which would probably be potentially moving, if you didn't mind clunky prose or have an actual grasp on the Walkers as scammers.)
Hard to know how it will have been rejigged, if/when it appears.
I'm assuming someone at PRH will have an Observer subscription to listen to the full podcast at one go, to see what new stuff is being alleged.
Part of the problem with what OWH might be is that SW has no real interest in nature, as far as I can tell, for all her protestations about wild salty vistas and peregrines.
She does a fairly sanitised feelgood pathetic fallacy/nature as redemptive shtick, designed to appeal to people who live in suburbs and watch Escape to the Country (I'm not denigrating them, incidentally, but just saying that's a lot of her market).
If you compare TSP or its sequels to something like James Rebanks' The Shepherd's Life, it's way less challenging of the reader and far more feelgood.
TSL starts off aggressively challenging its reader's assumptions about the Lake District as a leisure/tourist/Lake poet space of natural beauty with an opening about him and his 'written off as dumb' schoolmates smashing up the science lab and farting at a school assembly that mentioned Wordsworth, and focuses on it as a working landscape. It's a much less feelgood warm and fuzzy book than any of SW's productions.