You say that the spinnaker winches are aft, presumably of the jib winches, but don't tell us their relation to the helm.
If they are in reach of the helm and if you recognize that there's nothing sacred about a winch's use - always assuming a fair lead - then since you're likely to not use the 'chute while shorthanded, why not just use the spinnaker winches for the jib - as so very many folk already do?
G'luck
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