Spin Forest! Spin!
Join Date: Sep 2007
Location: Arrid Zone-a
Bikes: I used to have many. And I Will again.
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If it must stick out an appreciable length, then this isn't a wise thing to do. It may be too weak after removing that much material. Most posts are not that thick in the first place.
If it's not extended much, you'll probably get away with it.
If you must have it quite extended, there's also the idea of turning a 24.4mm stock tube to the desired length, with the top turned down and threaded. Find a large dia. seatpost with an inside dia. sufficient for internal threading. Cut about an inch of post, thread the inside and loctite your 24.4mm tube into it.
It should be very strong.