<yawn> Yet another one.
I thought the matter at hand was the gunk that collects on the jockey wheels and rear derailleur, and the chainrings. Irrespective of the oil-based lube... here's a thought -- just scrape the crap off with a flat-head screwdriver on your multitool. Or a knife. You don't even have to remove the chain.
It's not something that I would sweat on every day I ride on tour. Maybe once a month, or much longer, depending on the conditions.
Personally, I would just continue oiling the chain (with TriFlow in my case) as it dries out, then scrape off the deposited gunk on rings and derailleur as needed.
I think the most I have got out of a chain was 11,000km with oil-based lubes. Yeah, the chainrings (double) were probably shot along with cassette, but I sold the bike and it wasn't my worry by then. Actually, there was no chain skip on the lesser used chainring or rear cogs, so things must have still be viable.