Qdeathstar:
I am powering ws2812b leds so I don’t think a constant current driver will be suitable.
Neither would be a 12V supply... Those things need 5V, and the standard flexible strips a bit more than one power point every 5 meters, you will have to place 5V wires in parallel and connect them every meter or so. If you have the 30 LED/m strips you may get away with powering it from the middle but still not a good idea. With any higher numbers of LEDs, no chance with a single power point per 5m strip.
By the way, remember to connect the GND and DI/DO between the strips, NOT the 5V.
Qdeathstar:
datasheet for the chip i’m considering using, it has a nice drawing for 75w...
You're never going to replicate anything near that with a home-built circuit.