I’d also question what it would do for these players to be sent out, even in a meaningless game to get gubbed 6 or 7 nil.
Also what would the senior players left out think of the match appearance money missing from their wages ?
The back 3 doesn’t work when all 3 defenders are right sided. Muirhead on the left of a back 3 is a no from me.
Same formation as normal with Fitz on right and Xander on the left
My immediate thought was Xander on the left and Fitz on the right. Nguema might also be a wide option. Alternatively bring Fitz more central and have Robbo and Fitz supporting BBG and an extra body in midfield.
Time during the week to try things out and see what works