Most auto siphons are not rated for use at high temps. Your best bet would be waiting to install a valve at the bottom of your keggle. If you have high temp tube you can start a siphon by hand. Sanitize and lower the hose into the water slowly allowing it to fill then plug the end by pinching it off. Then pull the hose out and down, now filled with wort, and hook onto your CFC inlet.
Another option is if you have a super sihopn you can use the end piece on a section of high temp hose.
I would HIGHLY recommend you NOT to start the siphon by hand.