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@BrickMan
thermal might be your best bet. Used it to unseize SO SO SO many things.
strip the frame and bung it in th freezer. Do NOT wet it. might need a chest freezer not one of those crappy little ktichen things.
get 1 or 2 kettles worth of water boiling. Clamp up your frame in a workstand by the seattube (DO NOT TOUCH THE SEATTUBE) pour the water around the top tube, seat stays and dribble a bit down the seat tube but not as far up as the clamp. You might find pouring at a steady slow rate the best. Once you've emptied the first kettle (2litres?) with your gloves on give the frame a good old tweak while standing on the stand to prevent it moving (unless you have a proper shop job wiht a slab of steel on the ground). 95% chance you'll get it out
Obviously carbon isn't going to expand and contract like metal would, but i've used it sucessfully on all but ONE aluminium post and got a carbon one out (easton ea70 mtb post inside 90's kona l;dome). I'm pretty sure you'll see some sort of movement in a positive direction ;)