Nah, if you sign a player of that potential (and already a very good quality) he plays in his proper position.
But we don't have to worry about it. He's not coming here, this summer, at least
Get Sandro in, and he's a player that fills two roles (wide forward and central). Kev is then a rotation option for the wide forward role.
Presuming Lukaku goes, we still need a player who can act as our target man (links to Jorgensen, Willian Jose etc) and then a player who is more of a poacher to rotate as well.
That is basing it on the Koeman template that me and
@MorgsGoat like to use that his front three (in either a 4-3-3, a variant thereof, or a 3-4-3) contains a 'focal point' and then a player who has pace to burn on one flank and a bit of creativity on the other (ideally, this will be Barkley. If he goes, probably Sigurdsson). We then obviously have Bolasie to consider when he comes back into the fold, while Lookman and DCL will also get plenty of minutes.