Well I will disclose what hasn't work for me so far:
I tested on iOS 11.4 and on 11.1.2 without success. I purchased a lightning to USB adapter that allows you to feed power and plug a usb device into an iPhone. I programmed a RubberDucky with a long string of numbers (with the last one being the one that would unlock the device) and got the 1 minute, then 5 minute delay. I will note that neither device had the wipe after 10 failed attempts enabled.
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