Sorry about your loss. As an AF Veteran and former pilot, I know the dangers of rotary aircraft.
1. Klonopin is very easy to withdraw from, especially at that low dose, but you still must taper it. It is easier to withdraw from because it is a long acting benzodiapene (versus short acting like Ativan). As a result, it sorta weans itself from your body.
I presume you are taking it 3 times a day or even as needed. What you should do is:
Week one: if you can, break the .5 mg tabs into halfs, and take .25mg for a week at your normal frequency (3 per day for example, or whatever you normal freq. is). On week 2, take one .25 mg every morning for the first 3 days, and then skip a day, and then take one final .25 mg . Then stop. You will be fine.
2. Regarding the Prestiq, cut those in half, and take 25 mg in the morning for a week. You can then stop and you will be fine. Some people actually stop Prestiq type drugs "cold turkey" and do fine. You can't do that with Klonopin, which needs to be tapered.
Good luck, and I would appreciate an "accept" and some positive feedback.