This kind of voluntary promise is fully compatible with and characteristic of Christian faith. It's not something we see as a requirement or work to be performed, but an opportunity to receive blessing from God. In looking back at your questions, I repeat that it is normal and often beneficial to rethink things that have to do with our faith and Christian life. I also observe your questions seem to have something in common. We maintain that the sacraments and an active life of serving and being served with fellow believers is not only God's loving will for his people and the pattern set forth in the Bible, but that they are blessings rather than burdens.
Christian minimalism is neither necessary nor wise.
My wife and daughter have celiac disease and bake their own gluten-free communion wafers that our altar guild stores in the sacristy. The system works well in our congregation. You are describing a logistical problem. There must be a way for you wife to work this out with the hosting congregation. It may be more difficult at a larger convention.