I used to – it even got me taken off the schedule at one point. But the question is, should I really leave the sanctuary and kneel in the pews? Heck, maybe that’s the right thing to do but it sure seems disruptive. There seems like no reason too. It seem like bad liturgy.
O’Malley:
I’m kind of NOTORIOUS for having a G.I.R.M. on my computer.

If you haven’t already, download a copy (It’s available in pdf) & then print out the applicable sections. Ask for an appointment with your Pastor. When you see him, describe the situation as you described it here, and asked him how that conforms to the G.I.R.M., and show him the applicable section (which I hope you’ll have highlighted). BE POLITE and COURTEOUS. You’re trying to show him that the Liturgy Committee is disobeying the Church’s KEY DOCUMENT on the Liturgy and that what they’re doing is simply NOT licit.
Once you’ve succeeded, you’re going to need to meet with him and the head of the Liturgy Committee - It’s also important that you be prepared for that meeting & that you bring your copy of the G.I.R.M… You know your Pastor better than I do, and you know how firmly he’ll stand on principle once he understands the principle, or how quickly he’ll accommodate whoever is more persuasive or louder.
If he gives in, I’d stop serving - I wouldn’t serve a Liturgy that didn’t conform to the G.I.R.M… If it looks like he’s going to give in, you might even mention that you were serving AS A FAVOR, and that you don’t wish to serve in a Liturgy that disregards the Church’s own instructions on the Liturgy. It’s a RISKY Play, but it is what I’d do.
I wouldn’t go kneel in the congregation - I would do exactly what I just suggested. The Liturgy of the Catholic Church is important enough to do RIGHT, and it’s important enough to FIGHT FOR.
This isn’t just for you - The Liturgy is the MAIN WAY the Church teaches the Catholic Faith to Catholics and is ONE of the MAIN WAYS the Church preaches the Gospel of Christ to Unbelievers. and, They all have the RIGHT to an Obedient and Reverently done Divine Liturgy. This isn’t a PRIVILEGE reserved for those who are fortunate enough to belong to RCC parishes who OBEY the norms of the G.I.R.M., other Catholic Churches in Communion with Pope Benedict XVI, Eastern Orthodox Churches or some Anglican parishes in the Anglican “Continuum”. Catholics shouldn’t have to go searching for reverent Liturgies that are done in conformity with the norms of the G.I.R.M…
I hope this helps you figure this out.
Your Brother & Servant in Christ, Michael