Sorry mate but my tired brain just does get your point: are you saying that in order to get the recommended player you want you play for a whole week with a dummy at his position ?
If yes, I've go two questions:
1) If you win, that may mean you just not need the player in question.
2) if you lose, I think the price to pay is way too high when the meantime, you have the option of buying a scout or a FT that you'd power train.