Combo Streamer/Headphone Amp

First and foremost, best wishes with the surgery and for a speedy recovery.  Especially if this is a temporary stopgap during your recovery I’d consider an Audioquest Dragonfly Red and just use that plugged into your phone or tablet.  I drove my Hifiman HE400SE ‘phones with them quite successfully and your Sundaras seem even a little easier to drive.  Plus, if you ever want to take your music on the go in the future the Dragonfly makes a great portable travel companion.  Just a thought, and best of luck with everything!

I would not recommend a Node just for headphone listening.  The headphone section of the Node N130 is an afterthought.  The headphone section on the Node X is supposed to be much better, but you'd be paying $750 for a unit where headphone listening isn't its primary function.  However, if you're looking for a stand-alone streamer/DAC for your main system anyway, then the Node X might work for you.  But I would not get it just for headphone listening.

As @soix points out, using your phone or tablet as a streamer along with a dongle DAC (like the Dragonfly series) or a headphone DAC/amp might be a better alternative.  Cheaper, better sound, and much more portable.  I'd investigate something like the iFi Gryphon or the iFi Hip-Dac 3.

@soix @dinosore Tanks for your input.  I hadn't considered a dongle. I have a late model Samsung tablet that would work for this. Do the dongles provide a charger passthrough, or am I either on charge or on dongle?