I actually think that they can and should be taught simultaneously. As we do where I train with the Tohei Sensei ki warmups that mimic the form of the kata movements (and that can also be used as solo training if one figures out how to do that...) why NOT also teach slow, basic exercises to beginners, for ten minutes at the start of class, so people begin to develop sense of what it feels like
I can`t see much problem with that at all, but be careful not to teach too much that way. Teach the parts - keep them separate - and then join them up later. There is more than one way up the mountain but too much in one direction (unless it is straight up) and you will never get close to the top. Whch begs the questions - which way is straight up - Ha ha. We all think our way to be the best way, but we should keep our minds open and constantly re-evaluate. Two nights ago I was corrected on two things - made perfect sense - and it blew me away. And I have only been at it 34 years ...