Since the keets are so young I'd house them side by side for longer than a week... you'll want to give the keets some time to get a little bigger/smarter/agile. Plus the longer they are side by side the less aggression issues there will be when you finally do integrate. If you see the Turkeys being aggressive to the keets thru the cage, obviously you'll want to wait longer. And when you finally do integrate them you'll want to make sure that the keets have places to duck behind/hide behind but not get trapped behind and perches to fly up to just in case the Turkeys do get cranky with them.
When the Turkeys are young I've had no issues integrating them all together, but I have 1 older/adult Turkey Hen that will whoop the snot out of any new Guinea that I integrate to "her" flock of Guineas too quickly, and if any Guinea from one of my other flocks happens to fly into their free ranging pasture... it's on until she finally chases/harasses them back over the fence. Works out good tho, because her flock consists of certain select colors and I prefer that no other males hop the fence to breed those Hens and pollute the hatches, lol.
Once the Guineas are mature, and the breeding season comes around next Spring you may end up with some aggression issues from the male Guineas, directed at the Turkeys... so you may not need a separate coop right away but I would keep it in the plan as a possibility. Usually plenty of free range time when the hormones kick in helps Guineas burn off pent up energy/aggression. But if your Turkeys have "schooled" them well as keets and the Guineas respect the Turkeys then your Guineas may never act aggressive towards them at all. Hard to say tho, some male Guineas lose their minds during breeding season no matter what. After the Guineas are free ranging regularly they will hopefully go off on their own as a flock, working on the tick problem for you and earning their keep.
Good luck, hope it all goes smoothly and you are soon tick free.