No sir .. .. Think it through as of how it is configured.
My skimmer is the same design as yours and the original atman was internal.
I simply got pieces from Home Depot and installed the Hydrofoamer externally.
See how the air line tube feed is external? It will be the same on an external Hydrofoamer.
Take the output of the Hydrofoamer that shoots out the bubbles, it should have a threaded connection.
Take your Home Depot PVC fitting and maybe some vynal tubing and mate it to the bubble diffuser plate inside the skimmer.
It is worth the effort, I promise!