If you have internal halyards..... there is already an exit from lower mast... it's a simple task of turning the corner at the hatch cover and sending back to a halyard winch. An external halyard(runs outside the mast), will require a deck mounted block... either stand up or fixed 90 deg.... If you don't like clutches... you can install a cam cleat with a fairlead (wire guide) to keep halyard captive.... place it forward of the winch so you can use the winch for other things, such as a spinnaker halyard. If you can afford it, self tailing winches are pretty handy for halyard applications. A Lewmar 15 single speed (or similar) is more than adequate for Cat 27 halyards.
BTW you should be able to use self tapping screws for attaching turning blocks or organizers if you are over the mast brace/bridge zone.... Look in the cabin, under the mast atop the compression post, there is a wide piece running athwartship... it's 3 or 4 inches thick with wood core.