Good morning, Phil!
Okay, we're half way home!
(Turns out my update script had an oops... went to overlays directory, did it's thing... went to update start*.elf and friends and somehow I failed to tell it to go back a directory, so my elfs ended up in overlays :/ )
NOTE: Once the updates were doing what was expected, if I update bootcode.bin and/or Broadcom 270* files (which are part of a single download batch) all USB functionality (including the onboard NIC) become dysfunctional. It's unrelated to I2C... but noteworthy. Once I down-graded this batch I was able to get back into the RPi remotely, usb keyboard worked once again, etc.
SO... I have dtoverlay i2c-gpio launching eight additional ports, bus=10 through 17.
When the system completes boot-up I have... eight new ports. numbered 3-10. BUS= and/or REG= "seem" to have no effect.
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NOTE: Tried with/without reg= with no change in outcome. Placed bus= first in the argument order; no difference.
GOAL: The preference is merely to have eight ports in numeric order; bus=2 doesn't seem to be an option but that may be due to what ever we're missing here though it was attempted (bus=2 through bus=9).
Please check i2c-gpio.dtbo bus() and see if there's anything special needed. Thanks!