If it ever becomes a problem, there is a fix that might be ok. Give Reckless Experimenter the Summoning Portal text.
"Your deathrattle minions cost (3) less, but no less than (1) They die at end of turn."
That way, even with double Galvanizer, SN1p-SN4P will still cost 1 mana.
Not MIGHT be ok... this must be the best solution. It will keep any future problems from happening.