Thanks for this VC an interesting article and such an easy way to transfer species too.
I do it every year in our garden pond, keeping some eggs away from predators in an aquarium and releasing the young frogs about a month earlier than mother nature. It's working for me as this year we have the largest number of common frog (Rana temporaria) we have had in our garden since the grass snakes turned up 6 years ago.
Good luck to the red legged eggs!