A midi keyboard doesn't need a midi thru port to control a tone module. It only needs midi out.
But, if you have two tone modules and neither of them has midi thru, then you'll only be able to control one of then at a time from a midi keyboard that has a single midi out. But I doubt if that would ever be the case. I think a tone module without a midi thru is rare.
I just flipped through the AMS catalog and it looks like there are some good choices. Instead of getting two tone modules and a controller, why not get one module and one synth with a keyboard? For example, instead of
the JV-1010, why not get a Roland A70D keyboard? It's an A70 controller with
a JV-1080 synth module in it. The JV-1010 is $479 while the A70D is only $589. (However, the JV-1010 has more sounds---it also includes
JV-2080 sounds.) You can use the A70D to also control the phatt.
But if you really want those modules and a standalone controller,
the Roland A70 might be good. It looks like a pretty powerful controller for $469. It's 76 keys, 8 zones, control of velocity curves, a lot of controllers, and four midi out ports.
If an A70 keyboard is too big or is more than you wanted to pay, check out
the Fatar SL161. It's only $329 and has 61 keys. It's more minimal but at least it has aftertouch, a couple of zones, and two midi outs, and some other basics. Fatar may not seem like a big name, but I've heard that many (most?) other keyboard manufacturers actually use Fatar keyboards in their instruments.
There may be other controllers. I don't know the controller market well enough to cover everything. I assumed you didn't want something like an 88-note weight keyboard controller. For example, I have a Kurzweil PC88mx. It's a good piano action and has basic sounds built in, but it's more expensive.