Inrecognizable does not yet exist as a word, but if you use it enough, someone will pick it up and run with it- much like our modern word proactive. What is an "eroded" in? Both are honorable prefixes.
"Ir- is the assimilated form in Latin of the prefix in- before initial letter r, used in the same way in English (and much more frequent than in-) in words such as irrational," as well as irrecoverable, irreligion and irrecognizable. OED