Is there any character like that?

[RadioFM]

a and y have already been hypothesized to be related if not possibly variants of one another, and though a ≠ o most of the time, there are some instances where the scribe(s) writes a half-assed y ( ˆ ) instead of an o. Maybe yk ≈ ok in some way as well? Also, just as we have qo we have (admittedly few) qy, further suggesting that even if not directly related, at least both vowels would sometimes get mixed up by the scribe(s)