Agree with some of what you say, however a line has to be drawn somewhere regards the offside rule.
You are bringing things like interpretation of intent by the forwards into the equation. You seem to be suggesting that if a forward tried to be onside, but then accidentally finds himself in an offside position, then that would be a reason to not be offside? That's going to create even more uncertainty and suspicion amongst fans.
For the record, I think the offside rule should go back to there being "clean air" between defender and attacker.
Maybe even "limbs" being offside should not count as offside. Take the line from feet.