Stick with Auba and try out Fati and Torres at nine until we stabalise financially.
If you are going to spend these sums on Lew you might as well have gone for Nunez or Haaland.
I'd cap at 30m personally, and that would also be dependent on wages and contract length. Selling 600m worth of assets to clear debt then going big on a 34 year old player would make Laporta look like he and Barto are cut from the same cloth (well, for a time they were).
I get the sentiment of trying to take the shortest route to return the top, but a big money superstar who from reports, may not fit the salary structure we are trying to implement can be counter-productive long term. We will then be tasked to replace in 2-3 seasons time while age can catch up at anytime. And haven't we learnt that when age does catch up overall, the system for modern day football cracks.
Under no illusions that Auba is near being a world class striker right now but let's not forget that he is the top scorer in LaLiga since he arrived. While the right side lost Messi, replaced by Dembele and now lost Dembele. Could Salah also with a year left be an alternative for example, with Auba/Fati being at ST.