Nice idea.
But it is not like that.Except Pakistan all others would directly connected to our power grid and road transit after signings of these deals. It will be a mutual beneficial deal.
Afghanistan would be connected via Chabhar port.
Pakistan might get a lot of incentives in power transmission
if they would have sign this deal under SAARC agreement.
Now they will sign separate deal for it with India and may bought power from us with less incentives.
Read about CASA-1000 project between Tajik-Afghan-Pak. Same power transmission lines will be used to import up to 5000MW in 3-4 years time.