switching region code on PS4?

[BillBR]

Hi all,

So I'm saving up to buy a PS5 because I want to finally have a 4K player as well as do some occasional gaming. When I do, I'll have two PS4's left over. I would like to turn at least one into a Region B player (the other is on the fritz, so I may have to junk it). Apparently this can't be done by attempting to play a Region B blu, but can it be done by putting a Region B DVD in? And if I change that, will it change the region playback for the whole system?

I realize the "easy" solution to this is to buy both a PS5 and a region free player, but I don't have that kind of money and I also don't like to waste things if possible.