I would like to know, Does the prechamber cup itself get hot enough once running to help support combustion? Or does the glow plug stay hot enough once a few combustion cycles are achieved.

I used to fly glow plug engined model airplanes. Once in while they would stop unexpectedly and sure enough the glow plug wire loop was not in the present in the glow plug. I know that the glow plug engines were not strictly diesels but they seemed to have some similarities in that they they were not spark ignition. Their fuels were perhaps more active with methanol and nitromethane. I could see why they were two strokes to keep things simple lightweight and keep the glow plug hot.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.