Try wrapping the lines with insulation first.

But does that "not included" list actually stop clients from asking? Feels like some would just see it as a challenge to get that stuff for free anyway.

Man, a buddy of mine who does logos once ran into a client at a coffee shop. The guy was totally stuck on a design, just spinning his wheels. My friend grabbed a napkin and sketched out three ideas right there at the counter. They figured out the whole direction before their drinks even got cold. That kind of quick fix just doesn't happen in an email chain, you know? Makes you wonder what we lose with all the scheduled calls...