Add headphone PCB to TBD mini looper

[quad4]

Looking to add a headphone amp to a small looper pedal that I would buy.   

• Anyone know of a cheap looper that has space in the pedal to add a headphone amp?
• Anything smaller or better than the MXR Headphone Amp that is worthwhile? https://tagboardeffects.blogspot.com/2013/01/mxr-headphone-amp.html. https://diy.thcustom.com/shop/super-mini-headphone-amp/   
• Bonus points for a stereo option....

Would love to buy a looper with headphone output built-in, but nobody seems to make these (aside from an old, larger digitech that's not a fit).

I have a good looping setup on my pedal board, but when traveling light or for quick, casual practice, I'd like a small form factor looper/headphone. Don't need much of headphone amp, but pedal output level is not enough.  Possibly I could rehouse a mini-pedal in a slightly larger box.  Thinking of buying a low end looper ($50-75) for this.  The Ditto+ is available for $75 today...!