If I ran only one ropeman it would be on my linesmans belt and just use a prussik on my tether. I don’t think what you are saying is 100 percent unsafe just a pain. I wouldn’t climb using a 7/32 amsteel linesmans. I would be fine using it stationary while hooking a tether in. Where I wouldn’t want it is going around limbs. Especially in conjunction with using an aider. When I hit a limb my tether becomes my linesmans. I don’t switch back unless I hit another limb. Sometimes I will have to pass 6 or more limbs on the way up. I wouldn’t want to have to hook and unhook twice for every limb. At the end of the day it’s your call. What risk are you willing to take and what do you have to lose if it goes wrong? I personally don’t use a locking carabiner on my linesmans. That’s wrong and I know it but it’s a choice I will have to live or die by.