Options to plug in new device to ProfiLux 4 once 2 PAB ports already in use

Hi GHL Support Community,

I purchased a Ion Director that I received a few weeks ago.
Today, as was planning to install it, I realised that I didn't have a PAB port available on my ProfiLux 4. :eek:
Out of the 2 ports available on the ProfiLux, one port is used to control a Powerbar 6E and the second is used to monitor a slave KH Director.

What are my options to plug in the Ion Director?
i.e.: Can I plug the Ion Director PAB cable into a free slot of the KH Director Doser Slave to continue the chain of devices linked to the ProfiLux 4? (refer to attached picture for details of proposed devices chain)

Any advise is appreciated, thank you!