Forgive the newbie question – I am not yet well versed in the theme system.
Is there any way to possibly use multiple themes for the same installation? In other words, for example, have one theme in use for a specific category and another theme be default site-wide/elsewhere?
Not themes, but different styles you can. There is a class with the category name on the body.
Ah, OK. I’ve done that previously, or something close to it, so am familiar with the idea. Just wondered if there might be a faster way to adopt different styling between categories. Thanks! 
With SASS scoped selectors it’s pretty easy:
// put main theme here
body.category-support {
// paste another theme here
}
means that I can use different theme components too
e.g. standard for everyone, kanban if you switch to “task”
can you share a bit more detailed tutorial on how to do that, I would like to do the same but cannot follow you
@Falco and @downey would you mind to grant me some insight?
Moreover, can I add an entry in the hamburger menu what switches to predefined filter and activates the Kanban Board (or any other of the those lsited below)
In addition, is shall make visible
in the navigation bar.
아마도 이 지원 질문이 2년 반 전에 작성된 것이기 때문일 겁니다. 
테마 설치나 전환에 어려움을 겪고 있다면, 구체적인 문제를 담아 새로운 Support 주제를 여는 것이 가장 좋습니다.
완료했지만
여기서 논의되었으므로, 이를 좀 더 자세히 설명해 줄 수 있는 분이 당신일 것 같습니다