[pelorus32]

I see exactly what you are thinking...I greatly favour having the asymmetric "outside everything" and gybing outside as well. I think it really helps in going deep with the asymmetric if you can get the tack line nicely slacked away and rotating out to windward. I'd be concerned that, though you might be able to do this, when you gybed you'd have to firstly run the tack strop home then tend the luff to ensure it didn't foul the furler.

The "traveller" I had in mind was only connected to anything at your existing tack block. You would use that tack block for an endless line to which would be attached the "real" tack block.Through this "real" tack block would run the tack strop for the spinnaker.

On deck you would have the endless line running out to the bowsprit end, you would start with the "real" tack block on deck, reeve the tack strop through it and clip on to the spinnaker tack, then using the endless line you'd run it out to your existing tack block. Now you have the tack, on its strop out at the end of the bowsprit. Hoist away, sheet in and adjust the tack strop.

When you come to drop, go to the foredeck, use the endless line to bring the tack and its strop and block back to you. Do whatever you do: blow the tack, secure it, whatever takes your fancy.

Maybe I'm missing some difficulty but I discussed this with someone knowledgeable yesterday and they thought it a sound solution.

That's the trouble with work isn't it - gets in the way of the important things.

Edit: There would be a need for two endless lines probably. Whilst once you have it launched you can gybe it, without two systems you would be faced with a trip out to the end of the bowsprit to pass the tack strop if you were to launch on the "other" gybe.