We have a self converted campervan, small sink , fixed microwave and no hob.
Reclassified by the dvla back in the day before they got all funny about it
Never been asked whether it has a sink or a hob by any insurance company only 'some' don't cover self conversions .
Interesting point you make though over checking things with your insurance before undertaking such work

I'd have thought removing gas from your would make it safer and therefore less risk for an insurer....but what do I know?