Haven't tried this myself (I was more interested in the opposite conversion for a Flir One G3 Pro, but that requires transplanting the U1 chip).
It _should_ work by booting into update mode (so flash can be written), changing the serial number in manufacturing_data.txt (first 3 digits at least), and changing "connector_type" from "L" (Apple) to "U" (Android). The camera will then start cool_usb instead of usbiap2_poc (check via "ps"), and should work with Android.
For reference, here's my Flir One G2 IOS manufacturing_data.txt:
kyeSerialNumber=F02FCB011D0
mainBoardPartNumber=21200436301
mainBoardRevision=E
leptonQR=A0503426
visualCameraLotCode=CCM01-OUTI151006-00013
batteryLotCode=10160156300A21507320151012
leptonSerialNumber=503426
flirOneSerialNumber=FLIRONEF02FCB011D0D
flirOneVersion=D
flirOnePartNumber=435-0003-01-00
appleLotCode=201535AQ
Company=FLIR Systems, Inc.
The file "connector_type" just contains a single byte, either "L" or "U".
No need to remove the U1 chip. If "connector_type" isn't there, the presence of U1 will be used to create a new "connector_type", but if the file is there, it should override. Check /usr/bin/usb_monitor.sh for details.