From the gestures and words of Lewandowski some time ago it was clear he wanted to be at Barcelona and he even seemed to close himself off from other clubs like Chelsea and even some issues about Madrid.
And seeing that he has clearly said he wants to leave Bayern then I think what you said about ending another season at Bayern is a difficult one.
Lewandowski has openly said that he wants to play for Barcelona next season and Barcelona have offered Lewandowski but the price is still not suitable until now, Bayern have refused.
and regarding Barcelona's financial problems I think they have now tried hard to solve it including selling some of their players so that they can be used to bring in other players.
With Lewandowski's desire too big to play for Barcelona next season I think it will be a bit easy for the Barcelona team to get him.
Indeed this would be easier provided they have the money to pay the full release clause there but the problem is they are currently hard to get that money.
It would be pointless if they wanted but they don't have the money because Bayern have made it clear that they will not allow Lewandowski to leave if the price and full price deal are not met.