quó({f!gWh}ix)(//io1)ni(h)am(h) works, by inverting the flat sign and the quilisma group in the alignment process, and therefore avoiding the alignment offset generated by having a syllable being with an alteration, but the space before the oriscus is slightly too large. When reduced to a single slash, it is too narrow (almost zero). The closing and re-opening of the parentheses before the oriscus is made necessary by the fact that otherwise the oriscus clashes with the virga of the quilisma group.
Sorry to not be able to help further.
In Christo,
Matthias