You could
You could make it an external halyard if you really wanted to, but this gets a bit awkward...If there is a spare sheave at the top of the mast, then I guess you could try removing the sheave and dropping a line down from the top and see if you can grab it at the bottom - not easy to do.Best bet, if you really want one, is to unstep and remove the mast, unfortunately. At least this will give you the chance to do some other things to the mast, like checking all the fittings, maybe paint it if it needs it, etc.MC