If you wish to keep Overflow as your main CFW,but want the Rebug look, you´ll need to extract the lines.qrc "Waves" and system_plugin.rco "PSN Icon" all from a Rebug Custom Firmware with PUAD GUI, from the PUPs Dev_Flash.
The easiest way and hassle free way to do it, its do get
XMB Mod Collection Disc [PS3 EXTRA - ISO] by 0_obeWAN, which contains the Original Wave and the Red Rebug PSN Icon, making it more install friendly,than messing with the Dev_Flash files yourself.
https://www.psx-place.com/resources/xmb-mods-collection-disc-113-mods.520/