Thanks @kaiyes. Googling for UnCSS solutions, I’ve found this Meteor forums thread (which makes me feel dumb that I failed to find it while searching for similar forum threads before writing mine):
I can link you up with him. Go to this link and invite yourself to our local slack channel and he can guide you about it. I will ask whether he can manage some time to come up here and help you
To be honest, after initial failures, I decided to deal with it when my
app is ready to move to production, so it will take at least 4 more
weeks before I try.