I came up with a pretty decent solution (I think so, anyway) for the lack of LANC on the HV20/30/40. It's really a copy of other ideas on the hv20.com forum.
What you get: a brand new from Canon WL-D87 remote (battery included) hacked to work as a LANC controller, a plate to mount between your camera and tripod mount with a LED holder, to.....hold the LED. The IR-LED is removed from the remote and extended on some wire so it can mount in front of the camera, pointed at the IR-LED receiver. You can see that the plate is straight. I thought about bending it up, to point it more directly at the IR receiver - but then it would start to interfere with the IRVB focus ring, and there wasn't much leeway for gaps/angles. I found that there is no need to have the LED point any more directly at the receiver - it works great as shown.
I was using the TOS-Link cable, but found that way to be pretty unreliable - had to be adjusted just right to get it to work. It wasn't reliable for me, anyway. This design is rock-solid and works ALL the time. In my design, the LED mounts into the holder with a rubber plug, plus I've added some heat-shrink tubing to make it even more secure. The wire is about 2 feet long, which should suit most situations.
The mounting plate works with the IRVB focus ring installed. It's a tight fit, but there's a couple millimeter leeway that allows the plate to be mounted and still point at the IR receiver. I don't forsee any trouble with the mount of the plate/LED and other accessories that may be used - though I obviously can't imagine all the possible scenarios that people will run into. The prototype shown below doesn't have it, but I'll put either a thin rubberish material on the plate where the camera mounts, or will coat the entire plate in a rubber/plastic - type material. The plate is 20 gauge galvanized and should be around .036 thick. My tripod mount plate still has enough thread to make it through the plate and hold the camera secure. I wanted to make the plate strong enough to not bend easily, yet not be too thick to cause problems placing it between tripod plate and camera with enough threads in the 1/4" bolt to grab and hold.
I thought about a mount for the remote onto the tripod, but with all the different tripods and ways that people have them set up, decided there's not a best way to do that. Velcro would work nicely. Duct tape would work, too... Mount to your preferences
Price: $30 plus $5 shipping in USA. PayPal is good.
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Ordering: LANC system
BTW, I'm having my children help with this - we homeschool and this will count for some schooling credit.
If anyone has any suggestions for improvements, let me know.
See below for pictures.