Welcome to MFK!!!
Anything is possible. I hope you have alot of patience. There's been only one amphibius available in the US in the last several years. He was in the country for 2 years and fought recurrent bloat for most of his captive life. I was looking for one for years before this availability from a Singapore supplier came along. And, I haven't seen another one available since its arrival. You're going to be hard pressed finding one. I would imagine the chances of finding 2 available will be astronomical and finding 2 of opposite sexes would have to be the monument of sheer luck.
P. amphibius has yet to be spawned in captivity. In fact, little of their spawning behavior is known in the wild.