question

If you always want a delayed start, set the Start Voltage to a higher voltage than the alternator can deliver.

As soon as the voltage reaches the Start Voltage, the Charger will activate by design, so using the Delayed Voltage value instead would be the best option.

Another approach you could take is to wire up a countdown timer to the Remote Connection powered up the ignition.

I have a different Battery-to-Battery charger, but I also use a Delayed Start option as I think it is a good idea :)

The Hitachi 60A alternator has a really dumb internal regulator. Asking 40 amps output for a significant time over and over will probably not be good for a long life. I think 40 amps will be the upper output of that alternator after it gets warmed up. Depending on your engine your inrush current my be 250 amps but how much it drains your starter bank is minimal. One thing I would think happens is your lead-acid battery has a different resistance that the Lithium has and would throw off the voltage needed to stay in the 14v range. Your lead-acid with it's resistance at 80% or higher SOC would go into a different charging parameter therefore drop in voltage output. As I stated at first with the internal regualtor being a really dumb regulator. If I was trying to do this I would look at switching your priorities and charging your house bank as a priority and using an ACR to charge starter bank. But I would look into that direction to see if it is a solution. Mixing battery chemistries is something that works only if it is done right. good luck.

This from the online manual:

"Start voltage (V_start): At this level charging starts immediately. Default: 14V.

Delayed start voltage (V_start(delay)): Smart alternators can generate a lower voltage when the engine is running, therefore a lower start level is necessary for these systems. To ensure that the starter battery is recharged after starting the engine, charging of the auxiliary battery is delayed during this condition. The energy used during starting must be replenished to ensure that the starter battery remains properly charged. Default: 13.3V (Smart Alternator) and 13.8 (Regular Alternator).

Delayed start voltage delay (t_{start delay}): Recharge time for the starter battery during start level (delayed). Example: If the starter draws 150A for 5sec to start the engine, about ~0.2Ah is drawn from the starter battery. If, during engine idling, the alternator can only generate 20A, it takes 150A/20A x 5sec =37.5sec to recharge the starter battery. Default: 2 minutes."

So what @Wildebus is saying is that you must prevent the start voltage setting from initiating charging, this will make the Orion work from the delayed settings and obey the time delay there.