I wonder too.
If Pin 9 of the 50 pin CF connector on the R2 is grounded, then the R2 supports True IDE mode. (just the connector)
The adaptor you are asking about converts a 50 pin CF to a 44 pin ATA/IDE.
Two things determine compatibility, CF 50 pin configuration and IDE device used.
If the 50 pin CF slot on the Neuros is configured this way:
http://www.interfacebus.com/CompactFlash_True_IDE_pinout.html maybe it will work........
Ex-Navy