Hi there,
First, we now seize the D-ring to the upper shroud, in most cases. About chest-high. That way you have a high lifeline in the middle of the boat, where you need it most.
Some folks prefer inboard lines, mounted on the cabin top; this allows a shorter tether, making it unlkely that you will end up in the water, but it doesn't provide a fetch-up-against barrier like the outboard ones.
Johnson Marine is promising to produce a sort of mega shroud cleat, with a hole in it suitable for the jackline. This would replace the D-ring, which can be ... tricky to install correctly. How about if everyone here emails them:
info@csjohnson.com. TELL them you want them to produce this item, and soon. I have been pestering them about it for years, but I think they need to hear from the sailing community. Say something like, "I understand that you are considering producing a shroud cleat, suitable for chest-high jacklines. Do it soon."
I am sure that if they get enough requests, they'll get into gear. It might also help to hear from potential vendors of the fittings. Please take a moment to harass them today.
Fair leads,
Brion Toss