Try three turns of plumbing tape. If that doesn't work, you'll have to put a reducer in.
I'd just use a hose clamp on the 1/4" barb. I use hose clamps on all barbed connections.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk