For me I don't think the seat matters. Even in first seat I have nothing
against opening 1C and then rebidding 1H over 1D, raising 1H to 3H,
raising 1S to 2S (a slight underbid), and raising 1NT to 2NT (a slight
overbid). Also, I have nothing against opening 1NT and that would
apply in any seat.
Sorry but somehow I doubt that the above will be of any used to you, lol
Oliver