Alive,
The Ronstam extensions are nice but seems to not be very light.

The Marstöm extension looks nice and also costs plenty. The CST looks to be the smart choice, if it would not be the massive costs for shipping it all around the world.

I could see one Moth-guy building his own carbon tiller extension really light (and cheap), but probably don't have the time even if it would be fun. Waiting for reply from CST.

Questions: Always use telescopic? Wouldn't 2 meter fixed be enough (on a boat where skipper don't have to be in front of the front beam unless really extreme)?