If you want to switch them out, you should get the threaded fittings.
I personally dislike threaded fittings because they can leak and barbed fittings essentially never do. Opinions on this diverge violently. I only remove the line to dispose of it. Yearly roughly.
What you can do is choose lines that are on the short side of your requirement and then if you have a beer with a higher psi, slow the flow down in a way other than using a longer line.
The best solution to this problem, by far, is these epoxy mixers that you can buy for like a buck a piece from McMaster Carr.
There is the thread about them.