I used to have a Cal 25 on a mooring and lead the line back to base of the mast. Us can us a temp bow roller for chafe.

::
:: I would try a bow eye with a strong back-up plate. Most
:: people who moor their E27s in slips use carabiner-type
:: clips attached to the stem fitting which is plenty
:: strong.
::
:: Or perhaps a bridle could be attached with clevises to
:: the toe rail on both sides. The toe rail is plenty
:: strong and through-bolted through solid glass. The
:: bridle could be detached for sailing. However, as I
:: type, it occurs to me that the toe rail is aluminum and
:: might wear quite a bit with the boat on a mooring. ???
:: Maybe somebody else has a better idea.