It will work. I haven't used kessils but I have mixed 6500k T5's in with my reef lighting. I also used 5000k halides 30yrs ago. It's closer to daylight and all my corals liked it. In the wild, shallow reef corals are getting exactly that type of white light, it's only the deeper species that would get predominantly blue. The anecdotal evidence says whiter light causes more nuisance algae but I think you'll get algae with the right conditions regardless of your light spectrum. It's also generally excepted that most corals will grow faster under whiter light.
You may find it hard to blend without it looking 'stripey' but you won't know till you try. The tuna blues should get you the colour pop everyone is looking for these days anyway. I would do it.