You Are seeking an focusless setup. This is posible with keyclone, but has a slightly more comicated setup than what isboxer has. Keyclone is a realy good broadcaster, but isboxer offers more options teaks.

There is plenty of guides on how to setup a socalled FTL settup. Just fiddle with it and u wil get it right.
(note no software I tried yet is even close to how fast isboxer is on pip swapping)