Ok, a few things:
You need only one HS34 module for all your Dynon equipment.
The HS34 has dual ARINC-429 inputs, a single ARINC-429 output, dual serial connections, and a single analog resolver.
To connect to a 430, you need to hook both the VOR/LOC ARINC and the GPS ARINC to us. You then need to hook our ARINC transmitter to one of the 430's ARINC recievers.
You can split ARINC ouputs up to multiple units, so it can go to both the HS34 and another HSI head. One issue here- only one of them can command the course though, so I'm not 100% sure if we cleanly we can really support this. If you always used the mechanical head for VOR and the HS34 for GPS, that would work for sure. If you wanted both to go to the HS34 and only one to the mechanical, that could cause an issue.
You could do wild stuff like hook the 430 up via analog, but you loose a lot of features that way.
Finally- the ARINC data auto-scales on the GPS side as you get closer. This is one of the main advantages of this system. The 430 just doesn't output that data on serial. If you have a WAAS 430, it will do smooth scaling from the FAF to touchdown, just like a ILS!