Here is a BC Ministry map from around 1970 that I found in the Vancouver Public Library while researching the North Shore Mountains book, showing a trail from the col between Deeks and Windsor continuing north to the Capilano Mountain Trail and Marion and Phyllis Lakes. No doubt wildly overgrow, but on my to-explore list.
Now that's an interesting find! Perhaps easier to revive an old trail than to blaze a new one. But, if there is serious consideration for extending the HSCT (and making this connection), I would want the most aesthetically pleasing route to be selected.
Thanks for sharing!