External DAC and Pi headphone output?

Hi, I have a bit of an odd question. Is it possible to make Volumio send audio through a USB DAC and the builtin Pi headphone socket?

The reason I ask is i am slowly turning an old cassette deck into a Volumio box and as it has old school VU meters I want to get them working so I was thinking of using the pi headphone jack to power the VU meter control board leaving the DAC output to go straight out to my amps. This would also give me an easy way to make the headphone jack on the front work as well