Does this plan sound realistic? Yes. Is it? Based on personal experience and observation of others, no. Many of us make plans for an extended transition length (myself included) and due to the dysphoria getting worse once we finally face our problems, we usua;;y find it both unnecessary and unbearable to wait our original plans. My original plan started with my going fulltime around the beginning of this year. I ended up going fulltime 6 months earlier. Hormones did work fast as you are suspecting they will. I pass VERY well now and many people I interact with don't know I'm TS, but guess what? I'm not done with facial hair removal. What I did (and I recoment this to anyone with a mixed color of hair) is I started laser treatments in May of last year and was able to go fulltime 2 months later (after only 2 sessions, but I do have ideal skin for laser). As the hair got less and less, I noticed I had a mix of blonde hairs in my beard and so I have been switching to doing electrolysis for those now.
The nice thing about laser is that you keep the hair shaved as much as possible. With electro, you need to let it grow a couple days at least, but if you get rid of the dark hairs first, nobody notices the blonde ones because they blend in with the skin. I have been transitioning over from laser to electro during the past 2 months (although I am doing both still, since laser is free for me at this point). Sometimes I forget to shave and I may have a patch here or there of dark hair, but nobody notices that either. For the most part though, I shave daily due to the fact that I'm a perfectionist. I'm doing both genital electro (not as bad as one might imagine, although it is quite painful) and facial. I can get both areas cleared in about an hour now and I'm going every 2 weeks. Oh, that reminds me, I need to skip shaving the next 2 days.
I guess my point is, as you go along, be prepared to change timelines. I think just about everyone here who started out being serious about transition has done that.