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I'm not sure if anyone really answered the subject line. Having the word "safety" makes me look at this with the rider's safety in mind. Rear drop out cracks are common enough to have a pretty well known record of being a shame, a hassle, while can sometimes result in a sudden skidding stop more often as shifting or tire rub issues, but rarely has a fall down or rider injury result. (Significantly different then a front drop out fracture).
The down and dirty option is to grind off the chrome where brazing will be done, cut a triangular gusset to fit against the drop out's crotch and the chain/seat stays and braze that in place.
Just the same I would suggest moving on to a frame with no cracks. There's a lot of fish in the sea. Andy
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AndrewRStewart