Can Phantom switch be modified to convert all open phantom trades into live trades at the moment of switch? The only difference would be entry price, but exit would be managed same way as phantom trade it derived from?
This would help better precision equity curve trading I think.

You can do that already by script. Enumerate all trades, check if it's a phantom trade, close it and open a real trade instead. However this is normally not recommended, as it would enter trades not at their proper entry points.