No Effects Loop, is “headphone out” a solution?

I have an Orange Terror Stamp and Orange Micro Terror. I know the Micro Terror doesn’t have an effects loop but I use reverb pedals.

The Stamp can function as a power amp, and has an effects loop. Meanwhile the Micro Terror has headphone out.

Is it possible I could use the Micro Terror’s headphone out into the power amp in or return of the Stamp? So it would be the Micro Terror preamp into the Stamp poweramp via the MT’s headphone out