Rig a spin halyard and connect it to the bridle. Tighten and cleat off the spin halyard. Disconnect the forestay from the bridle, and ease the spin halyard to lower the mast.
To raise the mast, lift the mast, tighten and cleat off the spin halyard. Connect the forestay, release the spin halyard and sail off.

Since you're not flying a spin, you can leave it connected all times to the forestay bridle.