Benzos may help ease some of the symptoms but they may also add fuel to the fire and become and issue in and of themselves. Baclofen acts of the GABA-b receptor, benzos on GABA-a, and Gabapentin has its own mechanisms which hit neither of those. I would be very hesitant to switch to long acting benzos to get through this as they have a greater abuse potential and they also can kindle which is significant imo should you ever need them in the future, each withdrawal will be subsequently worse if you have to take them for any length of time. Take that info for what it is, I am not a pharmacology expert. I just don't see the point of adding something new and harder hitting to the mix.
Definitely do the taper, that should helpnresuce rebound symptoms. Generally I do a 10% reduction per week when I have to taper, and if I feel fine I may try to speed it up later in the process. If that taper schedule you are suggesting still causes you more rebound anxiety that you care to have just slow it down some. Also look into the Inderal (propranolol) as that helps anxiety significantly, and it can be taken as needed or everyday. I took it everyday for two years back in 2010 and then switched to as needed in 2013 with no issues. I still keep some on hand. For general anxiety I personally prefer the extended release and find that keeps me calm all day, but they do have a quick acting version that should be used for specific incidents, however I didn't find the quick release to be as effective. I recommend you try both and see which you prefer.