Dear ScottyPimpin,
you said
"i'd say the vast majority of "venomoids" are hard to consider safe,"
Your view or opinion, but the fact is ALL venomoids are safe. The other snakes you refer to are not venomoids . . . simple realy.
Venomoid = No venom ...
You also wrote:
"I'd be very interested in seeing a study done one THOSE snakes to see if any ever become venomous again."
Well take it from somone whose done the said study over 8 years and guess what and with whatever expertise 8 years with venomoids brings?
Not one venomoid ever regenerated venom.
I am also sure that if I cut off your head, it also wouldn't regenerate.
Perhaps of relevance is that a paper is in preparation now for a peer reviewed journal on exactly what you speak of, and that is 8 years of venomoids.
We do also have papers on the subject at:
http://www.herp.net
which I assume all the venomoid "experts" here have read.
ALL THE BEST