Use my exhaust fan modifications PID Controlled Exhaust Fan (Quiet!) and you can use the M141/M191 commands to set whatever chamber temperature you want whenever you want. This new fan behavior is generally quieter since its throttled, rather than simply banging on or off.
Personally, I’d set a reasonable chamber temperature (32°C or 50°C are common, and possibly up to ~60°C for PETG) during the print, so your heat creep pulse at the end isn’t so extreme. However, if you’re rather keep it just in the END_PRINT macro, I’d use M191 R, so it waits until it actually cools down before turning off the fans.