From quite a long time, I've been advocating to do a technical change on one of our products. I've given pro's and con's of doing this, along with estimated times and costs. This would reward us with a better image for the customers, which tend to favor this technology over our current one. This has been turned down many times, with different reasons in mind (some of which are time and cost related).
Now, in the meantime, I've been offered a position focused on this technology many times (at least 5 times a month). The last interview I had in place, the company basically said that "despite I look quite experienced, I can't take the position I was offered", suggesting I take a junior position (while currently being much higher in the "ladder").
Because of these issues, I'm planning to start a long course (a year) which should give me enough experience on the topic to get into a senior position straight away. The problem is that this course will require me to reschedule my working times. I'll need to leave 1 hour earlier to arrive to the course in time (which of course is compensated by coming to the office 1 our earlier).
The company is fine with time changes, as long as they make sense (physical therapy, commutes, etc). However, a reason such as "A course that means a company/position switch" might not be well received.
My boss already stated that this technology change I propose won't happen, and has in fact thought that I finally calmed down and saw nothing but negative points in steering the project's wheel. So, telling him that I'll start attending this course could mean he smells I want to switch to another job, rejecting my request to leave earlier, switching me to another project or even firing me (with a dark scenario in which I want to take an offer where I don't have enough experience/knowledge, or moving to a position of my area, with a similar outcome once I suggest to leave earlier.
I've already seen this in the past. If he dislikes something but then he sees the good part by himself, he'll even push you to complete the course. If he sees all the bad things in a topic, and later on you still remind him about this, you're gonna have a bad time. So...
With this in mind, and provided telling the truth is risky, should I tell him, lie to him or skip doing the course and looking for a less professional alternative (which wouldn't ensure me a good position after all)?