Streamer's without built in DAC options?

You don't need a streamer, the Roon Nucleus is it.

I’ve had an Ayre DAC and have updated it since 2011. I recently called Ayre and spoke with them because I didn’t want to spend a lot of money on technology that will change in a years time. I was told that they use a Melco but have had tested, and with good results, many various components including a MacBook Pro. I ended up buying the Bryston BDP Pi, added a linear power supply and so far, haven’t found anything objectionable. Yes, it uses a Raspberry Pi for its processor but the way it’s implemented is critical. Also, the streamer and the DAC are interdependent. I’m betting that for streaming, my biggest improvements will be from adding the Uptone Audio Ether Regen and the Network Acoustics filter. In other words, spending money on usb cable, power cable, switches and noise filters, etc..., you may come out ahead better than if you were to sink all of your cash into one component. Just a thought.

Bryston BDP with Soundirok app, works like a charm.

The simplest option would be to continue to leverage your Roon Nucleus to run Roon Core and storing your music on the Roon Core and/or a NAS device.  These devices are both connected to your home network and can be in a different room than your system.  Then you add a Roon compatible network player like the Simaudio Moon MiND2 or DCS Network Bridge and connect it to your Tambaqui DAC via your preferred connection (USB, S/PDIF, AES/EBU).

You already have storage and a computer to run Roon Core handled with your Nucleus so you don’t need a server that handles file storage or streaming through Tidal, Quobuz or other streaming software.  Brands like Innuos are fantastic servers but you’d be paying for storage and other features that you already have with your Roon Core.