"I like your idea as well and yes its a no brainer, however the powermax does not have any way to force it to the bulk charge mode or even have an LED/indicator that shows what charge state it is in."
PowerMax and Iota converters go into boost every time at first so you don't need an indicator like that. (They stay in boost for 15 minutes, then drop to Absorption voltage if the batteries are already well up in their charge, or stay in boost longer if the batteries need more of a recharge.)
You can usually tell (see below for an exception) what "stage" a PD is in by observing the voltage, so you don't need the lights unless there is no voltmeter handy. Those lights would have to be where you can see them, which depends on your rig's set-up.
There is one grey area when you might not be sure the PD converter is in boost. If the battery is low and you turn on the converter, battery voltage might only spike to something like 13.4 volts and start climbing from there. You might have to wait until battery voltage rises past 13.6 to know for sure you are in boost and it will continue to rise to 14.4. The lights would help with that, but again, not needed with PowerMax or Iota.