Pi-Amp+ and Raspberry Pi 7" Touchscreen

Dear All,

I currently use a Pi-amp+ with a Pi-DAC+ and a Raspberry Pi 2. I use a
19V 4,74A 90W power supply.

I would like to add a Raspberry Pi 7" touch screen to the whole stack
but the GPIO connectors from the Raspberry Pi are already used.

Can I connect the display power cables directly to the Pi-Amp+?
Which pins should I use?

Thank you very much for your help!

Best regards
Adrian