Not to deviate from the polka Mass thread, but since you asked …
The pastor, not the music director, is in charge of the music in every parish. It is he who needs to be convinced. He will need to convince the finance council, since hardbound hymnals are always more expensive (but you only buy them once!). Once permission is gained, the process is easy. You call Oregon Catholic Press and say that you want to cancel your subscription. Prepare for a barrage of questions and follow-up calls, as they really hate to lose a customer. They may call your music director in an attempt to get around you, and if you live in the Archdiocese of Portland, the chancery may call you. Try to be charitable.
I would recommend purchasing sample copies of several other hymnals for comparison which take seriously the mind of the Church on sacred music. These are namely the St. Michael Hymnal, the Adoremus Hymnal, and the Vatican II Hymnal, or perhaps another one of a similar nature that I’m not aware of. Share these with the parish music leaders and explain to them what the Church expects in sacred music. If the parish can afford it, send some of them to a Musica Sacra workshop or something similar.
There are other hymnals out there that I would not recommend. GIA (Gather, Worship, etc.) has well-arranged organ parts in the high-church Protestant style, but the theological content is on a par with OCP. J.S. Paluch (We Celebrate) was once one of the more traditional hymnals but today contains mostly OCP reprints and questionable theology. Liturgical Press (Collegeville Hymnal) is one of the better ones, but their missals and organ books are arranged in a very confusing manner. The St. Augustine Hymnal is a new one on the market and I haven’t yet looked at one, but their advertising makes it appear to be a less-expensive alternative to OCP.
After your parish has broken in your new hymnals, have a polka festival in the parish hall AFTER Mass.