Also do we have a logistic plan for the future? Like how are we going to spread clear seeds?
Sabrina and Homura both can easily deliver clear seeds to every one with a Santa impersonation. But who gets the seeds is the question, unless it's already answered in the past posts.
Also has Sabrina tried making grief control nodes to control grief from father away, or warping space with grief to make the area 100 units?
Clear Seeds are being distributed more or less as fast as we can hand them out, and are being given to everyone. The people who are utter monsters will additionally recieve a complementary beating and term in magical girl jail, but they will get free access to cleansing anyway because girls witching out is literally a fate worse than death that we aren't condemning anyone to for any reason.
That said, they are only an interim solution. We're hoping that with some time and science work, we'll be able to create a distributable cleansing method that doesn't rely on the tortured souls of former magical girls. Especially since as our dewitching research proceeds, Clear Seeds will be being turned back into their original Magical Girl, silmoatneously increasing the amount of cleansing needed and decreasing the amount available.
(Incidentally, when Sayaka gets read in on the time loops, I want to propose an experiment to see what happens if she cleanses using one of Homura's Octavia Grief Seeds. That could provide important data.)
As to your other question, we've discovered that we can piggyback on Mami's ribbons to extend our range across the city. We also learned we can cleanse Sayaka through one of her clones even if the clone isn't in the same city. It seems likely that further attempts to expand our range will rely on similar combination magic.
The fact that we can cleanse Syaka at effectively unlimited range would be a huge boon if we can get Sayaka access to the non-Sabrina grief manipulator power set. She could move Grief into her own Soul Gem at a remote location and Sabrina could immediately take it out. Wouldn't be an ideal solution given the soul hugs involved with that sort of combo magic, but it would be a step toward proper grief nodes.