You don't want to make him into another Xavier Marshall by exposing his batting weaknesses too early. Let Dessie work with him, and let Dessie say when he's ready.
As for Kirk Edwards, his technique is too loose to open the batting in Tests. He could do it in ODIs, but not as a Test batsman. Maybe he could come in for Sarwan in the middle order, but I don't have much confidence in him right now....
If Kirk is the alternative, then I would rather stick with Sarwan, and hope he regains his form sooner rather than later.
PS You only have to look at replays of the ODIs to see that Kirk is extremely suspect to spin. It's not anything to do with trying to score fast, it's a case of looking clueless, a la Devon Smith.

But if it makes you feel better, go on hyping up Kirk Edwards as the saviour of West Indies cricket, and we will see what happens when he gets his chance....