Hello. I believe I can be of help to you with this issue.
One of the 'dirty little secrets' of benzodiazepines is the difficult withdrawal symptoms one experiences if they have been on them a relatively long time---even when one is taking quite a small dose. It can truly take many weeks and even months to feel 'well' again because of residual withdrawal/adjustments a person goes through. So this is not an easy thing you are going through---a common experience unfortunately. But to answer your question---yes, Xanax and klonopin are quite similar and one can substitute one for the other and may only experience slight changes in their profile of side effects, if any. So it is "safe', in that sense.
Now, I can only give you academic information in answer to your question, not 'prescription' advice. But another tapering schedule would have switched you to valium from klonopin to make sure your blood levels are quite stable, and then taper you down from that. But you've tapered the klonopin quite well and probably, might have further tapered even the .5 dose in small increments, day by day. for 2-3 more weeks. Also, academically speaking, it is unclear what the tapering strategy is from the point of the switch i.e., did
your doctor tell you what the plan was going forward after you make this switch? I ask because as I said before, when trying to help patients taper, it is usually a good idea to make sure their blood levels are as stable and consistent as possible, and this typically means using a similar drug to the one they originally became addicted to, with a longer 'half-life',
meaning it stays in your system longer, more consistently. Then, you taper the longer half-life drug. But in this case, it is a little unclear why your doc chose to put you on a shorter half-life drug such as Xanax. That is, when people are on Xanax long term, it is common to put them on klonopin and taper from that because klonopin has the longer half-life. But all in all, what you are doing is from an academic perspective, quite safe; I would try to find out what the 'plan' is from this point forward. You are going to be taking somewhat higher absolute mg dosages of xanax, relative to klonopin, to have an 'equivalent' dosage of it; so probably, the assumption is that it will be easier to further taper from say 1 or 2 mg of Xanax (roughly equivalent to .5 mg klonopin), than to further taper the klonopin per se. Again, academically, this makes sense, however, it isn't that hard to accurately and finely reduce .5 mg of a medication. If it is in solid pill form for instance, one can crush it to a fine powder and them mix it with sugar or corn starch absolutely thoroughly, and then cut the MIXTURE in half, or fourths, etc. also, if one is taking capsules, they can buy empty capsules from their pharmacist and divide a full capsule quite evenly among say, 4-8 of the empty one, partially filling each an equal amount. I suspect you know about the very cheap pill cutters you can buy (a couple of bucks) to slice solid pills as well.
I will pause here and solicit your feedback and reaction to what I've said here.