Planning your training starts with organising your time to allow time and space to improve at the skill of climbing. Don’t work now to get freedom later. It won’t happen. Find work that gives you the freedom now, and that at least gives you the chance to start now and not later (later is too late).
Understand that this is not a mythical easy option. It’s a real option and it’s the hardest option. Safe = mediocre. Finding the answer to this problem will be the hardest training ask you’ll ever do. It’s great that you have to deal with it first!
Getting through the issue of finding the right work that fits what you want to do (as opposed fitting what you want to do to your work schedule) will most likely involve some radical action and some quite scary decisions or risks. Could you tell your boss that you want to work from home because you could produce more results in half the time? (and that you going climbing more is a good thing for your productivity, not a bad thing)?
It’s easier just to stay safe and not do it.
Then you won’t have to try and wonder how you can find the job that allows you this freedom, how you can redefine your current one, or whether you want the rewards enough to muster the effort.
In no time, twenty years will have gone past. Don’t turn round and find yourself still asking the same question.