KS has plenty of birds, and plenty of access. Their State DNR website has all you need as far as maps, contacts, etc goes. Showing up a day early for some door knocking may provide good results. With the right leg work and research, getting your two rios should be no problem there. A group of 3-4 friends are heading out for the bow only season this coming April, but I likely won't be able to make it.

If you want a slam for personal reasons, try NE for your Merriams. Most of NE is a hybrid turkey though, and may not count with NWTF, although the NW of the state is still a pure strain. SD has plenty of Merriams with plenty of access. If you aren't against flying, or driving alot, CO, AZ, and all the other rocky mtnstates have alot of public access to a VERY pretty high country merriams bird population. You can't beat a high country pine merriams for beauty IMO.

I am in the same process as you, working on the details to start in on my slam. Right now, I am looking at KS, or possibly OK for my Rio. SD or NE for my Merriam. FL for osceola obviously. I want to try an AZ turkey hunt one spring in the next few years, to double as a deer/elk scouting trip. I try to hunt 2-3 states each spring, and eventually want to knock the majority of the lower 48 off the list.