These are avoidances and further reinforce the fear of stuttering. Firstly it sounds exhausting to have to constantly be on guard and playing defensive jenga with your words (though blocking is also exhausting). Secondly what happens when you come across words you can't substitute or when rearranging an expected sentence sounds strange. If it works for you and you're happy with your communication then that is good. I find it easier to stutter and not worry about it. Since I've worked on acceptance of stuttering my mental preoccupation with stuttering when I speak has gone from 98% to 0-15%.