Carrick
Cleverley Anderson
Sneijder
Persie Rooney
or
Carrick
Kagawa Snejider
Nani Persie Rooney
The diamond is fine but it's just unnecessary. Rooney is best in Sneijder's position and then you have Kagawa sitting on the bench anyway... I wouldn't consider him worse than Sneijder. That's not to mention Welbeck and particularly Hernandez who has looked a threat this year.
The second one is silly IMO. Sticking Rooney on the wing is never a good idea and he offers more centrally, he's our best player, play him in his best position. Kagawa, Sneijder and Rooney when he drifts in from the left would all be looking to get into the same positions 'in the hole' behind RVP. It would just be overload and very narrow I think. Also defensively that's obviously not the strongest line up.
I think the only way it would work is
if Sneijder could play next to Carrick in a two, if not and he can't adapt his game there's no point in the transfer for me. Rooney could still stick to his central, roaming role behind RVP which has started to look great and Kagawa could drift in from the left - he is more suited to a wing role than Rooney. Not a lot of width though so I'd stick with Valencia to balance the side out.
Key point is whether he could play a deeper CM role, rather than just offering the same options as Kagawa and Rooney behind RVP. If he could reign in it and become more of a deeplying playmaker and keep it tighter in midfield then the transfer could be an option, because he is offering something different (and is an actual midfielder, which we have been crying out for). But if he is just an AM like your formations suggest then there is no point.
------Sneijder--Carrick---
Valencia---Rooney---Kagawa
--------Van Persie--------