That was the initial 6k so 500 account equal to 10000 rolls, I made a macro to sign up->skip tutorial->using direct link to skip login bonus->collect gift->roll the 3k jewels and take screenshot twice.
With the rate of 1 account every 2 minute, I can make 500 account within a day, but tranfer the number from the screenshot to the sheet is time consuming and easy to mistake when do in large amount so I made around 100 accounts at once and stop at 500 to make another 500 when the pool and rate up change.
3000 Jewels is 10 chain, so it is 300/0.07% ~ 428571 Jewels atm. Seem affordable as my union mate has around 170k jewels and 300 ticket save in one year.
I didn't check but I think the amount of SR himeless weapon is quite large so distinguish between SR Hime weapons and SR himeless will be a hard job.