I personally would like this option if both teams were on the same account it would 1) make transfers a lot easier to track, 2) create a system were the teams have a limited chance to ever play one another (perhaps only one of your teams can only be eligible for B3 at a team, such as only your first team maybe) and 3) the effects of botification and creating a team from a small country are removed. Both team are gone with your account, along with whatever cash you spent for your second team.
I honestly see no reason to purchase supporter as of right now (I actually have enough points to purchase and just haven't). The only feature I might enjoy would be playing in PL but as a newish team without a strong WR it would be difficult to even find an active league of my level.
Question? Should a player get to choose what country his second team is in or should it be random?