Give them a Harmony remote and wait for them to come back to you in a few weeks...lol
Jon, I doubt these are your clients if they are stuck on open source, you probably have bigger fish to fry...and that ain't Hasbeen...lol :)
Be polite but don't get sucked in for little or no profit. Sometimes saying no thanks is the best decision.
You could sell them the equipment and tell them here you go, good luck with your open source programming, they will either swim or they will sink and then they might call you back.
Bill's Electric & Home Theater & Plumbing & Automation & Small Engine Repair, and Animal Removal Services......did I mention we do remotes also?