Ultrastick Wiring: RCEXL Opto Kill Switch is NOT an BEC

Spent some time in a conversation with Google Gemini (their AI) and learned a lot I hope I knew and forgot about how the opto kill switch is not an IBEC.

The diagrams for the RCExl Opto Kill Switch look like this:

The RCEXL Optical Kill Switch does two things. It uses a light junction to separate the hard wire electrical connections so the 20,000 volts of noise generated by the spark plug do not flow back into the receiver and electronics interfering with them or frying them altogether, AND it serves to kill the power to the ignition. Power to the OKS passes through, so my 2S 7.4v LiPO would send up to 8V to the ignition, if the light sensor inside the is on. Here's how Gemini explained it:

The RCEXL unit has two sides that are "optically isolated" (connected only by a beam of light inside the chip) to prevent electronic interference from reaching your receiver:

1. THE RECEIVER SIDE: It plugs into your receiver to  get a signal and a small amount of power just to run the internal LED and the "gate."

2. THE IGNITION SIDE: It has a "Battery In" and an "Ignition Out" lead. You must plug a battery or regulator into the "Battery In" lead.

What happens when you flip the switch:

1. Switch On: The RCEXL unit closes the circuit, allowing power from the ignition battery to pass through to the ignition module.

2. Switch Off: The unit breaks the circuit, cutting off power and killing the engine.

I had my circuit like this:

This works, but apparently it allows interference noise hardwired back into the circuit. Options are a separate battery (two battery system, nice in big airplanes) or one battery and an BEC. Note that with this setup the RCEXL unit LED did not light up... so I think the RCEXL is bad.

Above is how I will be doing this circuit. I purchased a RCEXL Opto Kill Switch with BEC (see below). from Valley View RC. Curiously they are the only place that carries this.

Apparently this (above) is the OPTIMAL way to do this. It protects the circuit by filtering out the feedback, and offers a kill switch. I have one of these on the Pulse XT60 (need to see if I also have a RCEXL switch as this would be redundant).. Pictured below is the Tech Aero one I have, and is most recommended, in that its one of the few out there. Problem is its over $70 delivered, which is why I went with the RCEXL one.  IBEC's, especially one with a LED indicator light, are very hard to find, and nothing under the Tech Aero price.

I did drop by the workshop to check a few things, like do I have a IBEC. I have a UBEC but Gemini did not recommend this with the kill switch, and it added more complication to the circuit. I built a little holder to secure the receiver pack, and removed the RCEXL kill switch. I will likely return the one arriving today from Amazon as I don't need it, and am waiting for the one from Valley View, coming by some dude on a bike from Indiana, maybe 3-5 days?  Tomorrow I may try firing up the engine without the kill switch, wiring in directly to the battery through a 5V regulator. I am concerned that the touchy EVO 10cc will try what little patience I have left (hence today a day of rest).