It was never even said how exactly kurama's chakra unblocked the coils. Youre just assuming it was due to being another source of chakra. There are two possibilities.
A) Kurama's chakra unblocked them because it was sealed chakra... If this is the case, then yes, yin seal could unblock them.
B) Kurama's chakra unblocked them because his bijuu chakra is much more powerful than human chakra.... If this is the case, then no yin seal can't unblock them.
So as you can see... Arguing whether yin seal can or cant unblock coils is speculation and nothing more. So until we see Sakura using yin seal to unblock chakra coils.... or if it's stated as fact that it can unblock coils... You should stop trying to assert your fanfic as though it's fact.
From what we know, gentle fist can stop regular human chakra flow, but it can't do so to red bijuu chakra. Until proven otherwise, the burden of proof rests on your shoulders, and you have no legitimate argument other than comparing a tailed beast's chakra to a peasent's.
Ill leave it at that