crOOK,
I should clarify that though I do have a lot of experience with Gabaergic tapers - I have experience only with using extremely long acting GabaA's for withdrawal from other substances. Primarily using chlordiazepoxide (Librium) - which you obviously know about, but many people don't any more.
However, with the exception of a very successful taper off of Klonopin, I have no experience taper off a Gabaergic with the same substance or another. I've always tried to stay away from benzos because, quite honestly, I'd rather deal with 72 hours of non-life threatening hell from an opiate than a benzo withdrawal.
Well I've never taken it myself, but I know a bit about the history of the pharmaceutical industry which chlordiazepoxide definitely is an important part of. Knowing my fair share of doctors and the little they know about pharma (not blaming them), the first thing they will naturally think when somebody asks for a a drug (of abuse) that's not been commonly prescribed anymore for decades --> DRUG SEEKER. From there on out, any discussing your of your need for the substance will require some considerable diplomatic skills.
Unless they are very knowledgable about dependence issues, most doctors don't know that much about the benefits of tapering and substitution. They will of course know it can be done and that it's important for certain classes of drugs (pretty much mandatory knowledge), but beyond that they won't usually have a good overview about what schedules and techniques which can be used, much less so when it comes to temporarily substituting.
I'm not too familiar with the various benzodiazepines, but maybe if you tried to explain the situation and what has helped in the past they'd be more inclined to prescribe a small amount of another very long acting gabaergic drug for such undertakings. I don't think there are any benzodiazepines which have a half life even close to that of chlordiazepoxide, but there still are some out there with very long half lifes that the doctor might know of (
http://en.wikipedia.org/wiki/List_of_benzodiazepines).
It helps to let the doctor pick that substance, to give him a sense of control opposed to a sense of being tricked into prescribing the drug you were seeking all along. Looking at how knowledgable you are, given that you know this doctor well and he knows you, so there is some trust between you, it can actually help to let him know your full history of drug abuse. To the more simple-minded ones this would mean completely denying you any sort of drugs that have the slightest potential for abuse, but in some cases it will help them to work with you on whatever you are trying to achieve. Unless of course the story keeps repeating itself.
As for your life-threatening gabaergic withdrawals, if you actually do give yourself time to taper and haven't suffered of epilepsy in the past, you should be fine. I wouldn't want to go through the process myself since the fear would simply be there and couldn't be wiped out, but the chance of you really going into seizures is miniscule with how you are approaching this I would say.
About the tapers, since you did request advice. Again I'd start as low as still allows you to feel half-way safe and then maintain that dosage for a few days until you feel you are stabilizing again. From there on out you know your starting dose and can better judge how long the amount you have will last you. With this one being so uncertain I'd definitely go for tapering as long as possible, even if it's gonna give you a shitty time. It's simply much safer. If you go on the schedule you suggested, you might still run into trouble once you reach that 3rd 10mg day. You might be completely fine, but the trouble is that no one here can really tell you when it comes to baclofen.
EDIT: If you really don't feel safe, there's probably still time to illicitly score some phenazepam which has a ridiculously long half-life as well. It's been available on the research chemical market. Like I said and many others have said though: You should be perfectly fine, especially with your supply of gabapentin and alprazolam.
What I've also learned about Baclofen, that makes it particularly nasty, is that nobody has really found anything that fixes abrupt discontinuation of Baclofen, other than more Baclofen.
If all else fails, there's still alcohol (I'm personally just really curious whether that would work well^^)
