Chain Master link / Joining Link safe?

I've got an Izumi Super Toughness chain...

I like everything about it - especially the "Super Toughness" name - except the fiddly joining link that has a screw and nut

Does anyone know if I can just get another joining link (which is easier to use) and run it with that instead? And if so where from?

i am skeptical about the screw and nut too - supposedly the rotating action of the chain would either tighten or loosen the nut in time, just like pedals?

on the other hand, quick links e.g. the KMC one are rather thinner than other links of the chain, making it less "super tough"?