There's always the Analog Devices AD5791 that's used in the Schiit Yggdrasil. Granted, it's only 20 bit, but it's still a true R-2R ladder. And expensive at minimum $60 a pop.
More discrete R2R Mulibit dacs.
There are many now going to the trouble of doing discrete R2R Mulitbit now that the last/latest Burr Brown PCM1704 multibit chip is no longer available "rip".
https://www.vinshineaudio.com/product-page/denafrips-terminator-r2r-dac
Cheers George
https://www.vinshineaudio.com/product-page/denafrips-terminator-r2r-dac
Cheers George