Is there any kind of IFR let down for Chalgrove,
I don't think there is a published Instrument Approach Procedure (can't see any plates for it in SkyDemon) for his destination field. As for an ad hoc homebrew procedure, others on here have suggested a nearby VOR and NDB could be used to fashion an approach but that carries enormous risks. And finally there is the option of utilizing another nearby fields published approach for cloud break then scud running back to Chalgrove. But based on the weather reports and terrain that also sounds like a very risky proposition.