How to use TD20x and 2BOX together

[123qwe]

First of all , I have read some topics by many keywords ,
there are some useful relational topics ,
but ... probably I can't understand very well if they do the same goal ......
because I can't read English very well .

I have a Roland TD-20x module and a TD-30KV set .
The kits I have : PD-128 , CY-14 , CY-15 , PCY-100 , PCY-155 , KT-10 , VH-13 .
I know these kits have no problems on 2BOX except the VH-13 .
So ......

My goal is ...
I want 2BOX sounds , but I want connect more kits and I want VH-13 .
Because it is hard to get the 2BOX hihat controller ( mod by some user ) in Asia .

So I'm planing ...... Sell my TD-30 module , keep the TD-20x .
Get a used 2BOX set because the price here is as similar as just one new 2BOX module .

And connect every kits to TD-20x , use VH-13 sound on TD-20x itself .
Then midi out to the 2BOX module .
So I can get good sounds , and I can play more kits than just one 2BOX ,
and I can use a good hihat VH-13 .

But ... I don't know is it possible ?
1.
Can I use VH-13 sound on TD-20x , and midi out the remain kits to 2BOX module ?
2.
Can I output the 2BOX sounds back to TD-20x mix in , after 2BOX process the remain kits ?