Ivan Toney might be the guy.
I just don't really see him ever have genuinely bad games. 2 years left on his deal, value might be lower due to the gambling stuff. We could certainly do with getting 2 forwards next year and just move on from Martial and Weghorst.
If we can't get Kane, Osimhen, and don't pick or can't get Kolo Muani, Vlahovic or Ramos* then the obvious move is to sign a known quantity and the highest upside option around. So that would be I guess Sesko, Brobbey (Ten Hag seemed to want him and he's scoring goals), a South American (seem to be more Brazilian than Argentinian 9s in the pipeline?), or a guy who might be in jail like Wahi or Greenwood but is rated as a potential star (Toney might also be in jail but I mean not for anything actually gross) or someone who emerges in the next few months.
I also wonder if there's a chance Nkunku could get out of the Chelsea move. I assume not, but stranger things have happened in football and we should have CL and they won't unless they somehow win the tourney this year which at the moment you can probably retire if you bet on it.
The safe, 2nd tier options I would wildly guess that the club is looking into:
-Toney
-David (scored goals all 5 year of his career so far and on pace to hit 20 in the league for the first time, good presser, can play the quasi 10 role Weghorst plays for us at a much higher level in basically every respect)
-Thuram (because free and good physical qualities, not sure he's a serious consistent goal scorer the track record just isn't there)
-Gouiri (good prospect at a weak position, 1 in 3 in Ligue 1 from basically the day he turned 20 is a decent scoring record, lots of good players have produced similarly, doesn't seem like there's a ton of consistent 20+ goal guys in that league generally)
-Embolo (boring but strong and good back to goal, now scoring goals and Monaco bought cheap)
* or can't get him, he might prefer somewhere else and I could see Real Madrid (sign him up to backup Benzema and then compete/rotate with a different style of 9 like Endrick and let them battle it out like Higuain and Benzema while they're young enough to not lose their minds over starting like 15-20 total games some seasons while the other gets 30-35), Newcastle, Bayern, Chelsea even Arsenal if they get a huge offer for Nketiah from the mid-table and want to loan Balogun to a prem team for one year or Jesus has an injury set back) getting involved.