It's not impossible to find bargains that are ready to make the step up.
The likes of Szmodics, Maddison, Eaves and Jodi Jones are more than capable of playing in the Championship.
We don't need a whole new team. Long is a decent option in goal, with Burke and De Wijs we have a good centre half pairing (McKenzie is adequate but not convincing cover) and Lichaj offers a good, experienced head at the back. Brandon Fleming could step up if he has a decent pre season. Stewart and Batty are great midfield options if Henriksen does one, plus Irvine and Sheaf are also in there. The wide positions are an issue, because that's where we're going to be light if our two stars leave, but Toral and Milinkovic are contracted, we just need a solid #10, cover on both wings and a striker.
So, can we sign two wingers, a striker and a number 10 from the lower leagues and cover the rest with loans and frees? Yes. Yes we can. I've mentioned four of them above.