The Marsh > Maxy bit would not cost an extra trade however it is still 2 in total; effectively Marsh, Finch > Khan, Renshaw.
I'll be giving this a go tomorrow. I have 1 trade left.
I have Renshaw E on the BWL bench. Meredith was ready to come in, if Renshaw failed
I'll take Renshaws score as I can take Sams VC score.
I'll trade Meredith to Maxy, bringing Maxy back in. Therefore still having 1 trade left.
I can then trade out MMarsh as my 4th.
Is this the way to do it?
Edit: haha, just tried it. Worked perfectly.