The hatch on the poor unfortunate boat shown is wider than mine. To either side I have room for halyard winches. This winter I am making a 'pan flute' out of PVC to lead the lines through the curved coaming (aka 'dashboard') on my 1974 Mk 1 H25. I will post pics of this when it is done.
At present (still working on this boat) I have it laid-out to have halyards led aft. But this is of dubious value to the singlehander. So I devised an idea that left me stupified with how brilliant it was...
To starboard I have both main halyards. (The topping lift is on/in the boom.) To port I have the primary (red) jib halyard and the main-reefing line. Thus I can slab-reef the main from the hatchway, which I consider essential for any less than three people on the on-watch.
The secondary (green) jib halyard and the spinnaker halyard remain on the mast. When racing, the foredeck people shuffle the sails and the helmsman or tactician takes the halyard for them. If I am alone I hoist the jib on the green halyard so that it can be done from the foredeck. There is a stopper there for the spinnaker, which would probably not be used with a jib up at the same time, so the green halyard would remain off the winch and just belayed somewhere. The red halyard (aft) can be used in case something IS up with the spinnaker.
The (internal) pole lift, which can also hoist a spinnaker staysail, is on the mast to starboard where I moved the original little winch for it.
I like this system because it allows for these options and of course incorporates the concept of having spare halyards which anyone going anywhere significant (out of sight of BoatUS) should consider. If you have only a single jib halyard consider using the spinnaker halyard for when you are alone. But I recommend having the spares. It took very little work to cut the spar and fit in a new masthead channel and now I have a total of 6 halyards (not including flags), any of which can be used for anything in the event of some catastrophe (or whatever PHRF will allow for a race event!).