Consider a bow roller on the end of a folding 'bow sprit' . Think elbow joint. Folds up and back beside forestay fiting. Maybe angled to miss furler drum.Strong, big pin,easy.Or roller on a two position square ss tube.Pull pin and slide inboard.replace pin. Eye on the end for the drifter.
Such a folding sprit tends to fold downwards or sideways when trying to recover your anchor on a wind and swell,when it is jammed under a rock.Too flimsy. Better solution is a 1/8th inch thick stainless nose cone under the roller, to take the bashing from a swinging anchor. Then you can make your bow roller short, and as strong as any rode you are likely to use