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@Purple_Mist
No offence, but your knowledge of chemistry suggests that you probably don't have a hazchem licence to acquire mercury and it's going to be fucking expensive in smashed thermometers! Not to mention, how are you going to place it where it is required? Are you aware of how toxic it is?
Drilling the seat post to a narrower wall? You have a drill bit that can get to the bottom of it? You have a pillar drill with a long enough quill? Does it run straight enough at full extension not to fuck the frame? If you do, then why not just drill the bastard out and re-hone the tube? Again, it's my humble suspicion that you do not have access to a mill/drill of that accuracy and even if you do, the fact that you are posting on here suggests that you do not have the engineering skills to use it.
You have a lovely frame there (if I'm being a cunt, it's only because I'm jealous!) and you have a really tough job on there. If you aren't certain you can do it right, there is no shame in paying someone who can. Otherwise, caustic soda will do it, just be a little bit patient!