For anyone with an SM-A536U,
Android 13/One UI 5 can be now downloaded and flashed via Odin (patched). Firmware for the model can be found here:
https://samfw.com/firmware/SM-A536U/AIO/A536USQU4BVK3
Initial impressions are pretty good. A bit laggy, but manageable. The CSC of the firmware doesn't match my phone's CSC, which could explain a bit of the lag. The phone, including cellular data, is still fully functional regardless of the different CSCs. I'll wait until the update is available for my CSC and I'll compare.
EDIT: After about 15 minutes, the phone isn't laggy, everything is even smoother than before, AND the camera shutter is instant! No more shutter lag.