A big part of the reason BGA is considered easy to eradicate is because there's the option of antibiotics. Which typically destroys it completely, with surgical precision. And it will not reappear, regardless of tank conditions, unless reintroduced from an outside source.
Why would antibiotics damage your crypts? Plants are not bacteria.
Why would you avoid any risk of damage, imagined or real, to the point of giving up and destroying the plants yourself?
No harm attempting to deal with it first through other means. Sometimes it works. But once your patience is exhausted, it's time to stop avoiding the most reliable cure.