So-called "chlorine shooters" in S. Cali and Arizona have done it for years, but only in concrete pools with deep ends. They'd run CYA between 100 and 150 and inject about 15 - 20 ppm of chlorine, as gas, into the deep end. "Pool Chlor" was one of the biggest of these companies.

Low phosphates is a whole other thing. The way it's marketed mostly does NOT work. If you want to do both, you probably need to learn to do low phosphates, first. Phosphate control is a METHOD, not a CHEMICAL. If you MASTER low phosphates, then you won't necessarily need to go high CYA / high chlorine to enable 1x per week treatment.

Though, what you'd probably need is 1x per week, plus a small standard bleach dose every time the pool was used. For many IG pool owners, that's about 1x per week. But if your pool is used a lot, then the protocol would have to be adjusted.