Screen tablets are pointless, especially for sculpting with the exception of the huge 27" ones or fully integrated ones (ipad)
There's numerous problems like you have to use screen mirroring anyway for most applications, there's no ergonomic solution of where to place a small screen tablet and you'd be looking at the main screen anyway.
Just get a normal drawing tablet without screen and use the rest to buy a 3dconnexion device. You'd be thinking that the disconnect between cursor movement and pen movement makes it awkward, but it doesn't you already are accustomed to that by using a mouse and your hand not getting in the way of seeing the content is also a benefit.