4500+ regulator questions

Does anyone have any suggestions on a regulator that can go past 4500 psi ? Ill never go that far but id like to be able to use all of 4500 if i choose. Yes i veey well aware of safety. Ive seen guys use nitrogen regulators ? 6000 inlet and 6000 outlet or something like that ? Im having problems finding regulators i can adapt or use on my scotts tanks to my texan . Thanks
 
altaros has a tethering type regulator for around 150, i think its rated to 4300, works great i got one, most bottles dont sit at 4500 anyway .. pretty sure huma has something similar .. tip, if you go for altaros find it on ebay so you got some protection ordering from overseas, lots can happen between here and there and directly off their site is a big risk ... took mine 15 or so days to arrive ..