Hi miss zuka
Sorry to hear of your diagnosis. But as you'll probably already realise from your reading on this forum, there is much to hope for. Being determined to lead as normal a life seems a great start. Most cases progress slowly so you can get used to how you are. And there are plenty of workarounds which help us cope with restrictions better.
I too spend most of my day typing, and one-handed. I never was a touch typist so it might be easier for me to accept my slowness and inaccuracies. At first I tried to continue using both hands, but it got as silly as a Morecambe and Wise sketch - I hit all the right keys, just not necessarily in the right order. A combination of switching to one hand (fortunately my dominant one anyway) and the drugs means my tryping is mosely KO. But i agree with you about slowness.
Anyway, none of that answers your question. Probably coz I can't, never having done such exercises. Do you have a PD nurse? they could probably help, and maybe get a referral to an occupational (um I think) therapist - I do believe there are ones who specialise in neuro conditions. i certainly know exercise in general helps us generally (dammit, prefer slobbing, myself), but I'm not sure how much it can help restore fine motor function. (Otherwise, you'd think that the exercise of trying to type two-handed would be the best sort anyway - and all I get when I try is much slower, more frustrated and greater inaccuracy.
There's always dictation programs. some people swear by them, others just swear.
Let me know how you get on. I'd be interested if you found any alleviation.