Can I use a streamer with an internal dac when I have an integrated with an internal one?

If it's not too cheap for you, the Bluesound Node 2i gets good reviews. Might be worth a try, especially if it can be had on approval.

You’re not looking too hard. There are plenty around w/o DACs. The object is to find a DAC you like and then get a streamer. They all have various I/O.  Better upgrade path, although you will get great resale for a BluNode.

My Mytek Brooklyn BB has essentially taken me out of the market when it comes to streamers and DAC's.  It mates near perfectly with my modest, admittedly slightly mellow PrimaLuna/NOLA Boxer system. When the source material makes it available, I get excellent soundstaging and lovely timbres. Mytek was also both gentle & responsive when I mistakenly thought the component needed warranty work. My problem turned out to be simply a matter of changing a couple of settings on my Windows laptop, something that Mytek did when I let them remotely access my computer.

I'm looking at Aurender N10 and Auralic Aries G2.1
both without Dacs

I would guess the Dac in the mytek would be better than the one in the integrated. You could absolutely run it either way. 
I have not seen too many reasonably priced streamer only options without dac. Would be interested to hear about any as I don’t use the dac inside the bluesound node.