Are there any after-market LED meters for the XPA-5 available?
I've never seen any aftermarket displays, but there shouldn't be anything unique about the XPA-5 other than 5 channels. It does seem like a good DIY project, I did find one schematic, but didn't look at much detail.
Keep in mind that the power meter in the above schematic is at BEST, advisory. The loading resistor is based on YOUR speakers being a resistor. That is of course, not the case. A NOMINAL 8 ohm speaker may be from 4ohms or perhaps lower, to 16 ohms. Some examples may be worse. Some speakers spend a LOT of time at impedances OTHER than the 'rating'. This means that your meter will tell you SOMETHING, but not really 'watts'.
Magnepan MG1.6qr HSU Research VTF-2 MK3 2x Parasound A23 Parasound P5 Cambridge Audio DACMagic Plus Sony PS3 x4 @3foot runs of 10ga Belden speaker wire. GRADO SR80e on-ear headphones iMac as music server (2009) Panamax 5510 w/) ISO transformer LG 65" B6 OLED display