Oshimen 90-100 million + 30 million gross per year (would earn more than lewa)
Munoz contract till 2029– would cost 30-50 million + wages
Schlotterbeck 40 million + wages
Grimaldo 15-20 millio + wages
(Thuram would also cost about 60-90 million+ wages)
That would be 190 (+\-20) + wages
i would be very happy if we get just schlotterbeck

Keep trying...
Munoz will be let go for 20-25m, wage will be max 5m gross
Slotterbeck's contract ends in 2027, worst case 30m, wage will be max 7m gross
Grimaldo same contract, worst case 15m, wage will be max 8m gross
Rashford's RC is 30m, his current wage is 14m gross
Osimen and Thuram can both be gotten for around 80m, wages will be around 12m gross
if you do the amortization (5yr contract for Schlotterbeck, 4 for Rashford/Osimen/Thuram, 3 for the fullbacks)
the total ADDITIONAL cost is around 78m GROSS per year
Now, you have to subtract the yearly book cost of ones leaving or let go, like Lewa (40m gross), STegen (20m gross), Kounde (30m gross).
Those 3 alone are enough to cover the cost of all the above transfers
Oh, and all that is without taking into account the fact that 1:1 means we won't have the same salary cap (of 351m now) that will rise drastically (above 500m)
PS: All that of course under the condition that Fatporta isn't lying again, and the club will be in the 1:1 already this winter, or at least by summer