Phil,
I just trialled a system that seems to work rather nicely.

I have my kite rigged the same as shown on the Mossie web site. That allows easy deployment of the spinnaker when either sloop of Uni rig.

When the halyard/downhaul line goes under the tramp near the rear beam but before it goes into the shuffer sock it have sewn two sheaves to the bottom of my tramp.
I have another attached to the a bungee chord that goes tru a saddle with a ferrel to the centre of the tiller cross arm.

The downhaul line goes below the tramp thru the first sheave sewn to the tramp then the one on the bungee and then the next sewn to the tramp.

The way it works.
Normal sailing the bunge is lose and does not influence the movement of the tiller.
When you go to drop the kite and tension the pull down the bungee attached to the tiller is tensioned holding the tiller centre while the kite comes down.

It works the same going up but does not put as much tesnsion on the bungee.


Normally when you rig a kite some slack is needed in the halyard so you can get a good armful of line when pulling the kite up of down.
This setup above has an added bonus of removing some of the needed slack halyard off the tramp.

Thought I'd mention it because it is just another way to make single handing with a kite a little easier.

On the issue of making things easier.
When the kite goes up the mast needs to rotate. If you don't get good rotation it looks very unstable even with the main sheet tensioned.

Rotate it and your safe. I have a system that automatically forces positive rotation as soon as the rotation line is eased. I've also given up on dual cleats for the rotator.
Single RF5 with twin tail means you can never go around the bottom mark and realise you didn't cleat the other side of your rotation spanner.

These are little things that I personally find make life easier when single handing with a kite.

Regards,
Phill