I still do consultancy in my old area of expertise for the equivalent of about 1 month a year. Working for a charter company easily allows me the time tio do this. There is no need to take half a year off. However if you want to do more than this you need to consider your future airline employer carefully. A LoCo or regional will have you working your socks off for them so little spare time for other pursuits.
As you are not finished training yet, my advice would be:
Get that first commercial job - any flying job. Gain experience and hours for a couple of years and if your roster allows keep your other interest going. Once you have the experience and hours for your long-term preferred airline apply to them and if you get in go part-time after a while. Most airlines will consider this without too much fuss. That will allow you to devote up to 50% of your time to your other interests - Any good for you?