Looking for a protocol hack to connect 1.7,1.8,1.9 users

[Lucasa]

Title says all.

 

[Lucasa]

use 1.7/1.8 protocol hack, then install viaversion to allow 1.9.

What's via version

 

[Lucasa]

https://www.spigotmc.org/resources/viaversion.19254/

Could 1.7 plugins work or would I need 1.8 plugins and would those work

 

[Lucasa]

Myiume Or, more preferably, just have two servers; one for 1.7/1.8 and one for 1.9!

How do u do that