As Christopher has said, if you have a balanced hedge you only freeze your position and then swap slowly kills you until you do something about it.
If you have an imbalanced hedge, it will only work if price moves in the weighted direction. Using your example, you would only be able to profit if price continues to move south (0.08 SELL trumps 0.05 BUY).
If price moves north, your losses are accruing faster than you can offset with the buy order. So now what do you do? Hedge the hedge?
Okay I think I got this, so: We add our hedge-trigger pip value AND commission of our hedged trade and re-calculate our TP for our original trade using an EA.
Is this correct?
Best solution! Don't Hedge! Just use a stop-loss and accept that the market was not in your favour and start looking for the next possible setup based on your trading plan!
Both our "HedgeTrigger" pip value, Swap((when the swap is added - usually at 10pm) or 'rollover fee' as it is sometimes called) and comission will be converted to pips and added to the takeprofit of our original trade (this will be a takeprofit modification order).
I'm sorry, it doesn't work that way. Really.
You have a gap between your first order and your hedge. That gap needs to be covered. It can't be covered if the hedge is balanced. If the hedge is imbalanced, it will only work in one direction.
Think about it. If you could never lose by simply hedging, do you not think that people far smarter than us would have implemented it a long time ago?