The Equipment Rules of Sailing basically tell you to look at your class rules
H.7 WEIGHT MEASUREMENT
H.7.1 Conditions for Weight Measurement
The boat shall:
be dry.
be in compliance with the class rules.
4.1.7 Weight - The weight of the hull in dry condition shall not be less than 50kg. The weight shall include all permanently fixed fittings and bowsprit, but shall exclude sails, spars, standing rigging, centreboard, rudder and other loose gear.
with the current rules if your safety equipment is permanently fitted, then it would be included, however if it is loose gear it is not.
Presumably there would be some sort of bracket permanently attached to your boat that would allow for the quick release of your safety equipment if you needed to use it.
I would suggest that if you were to state that the safety equipment were always to be carried while you were racing then it could be classed as permanent and so part of the all up weight.
It is then up to you to ensure that all equipment present when the boat was weighed is present at all times when racing, if it falls off then you would have to retire from the race.