If you want the basic 3.5mm to 4.4mm, you can get the Shanling M0 Pro adapter, they are the same.
We also sell the one from XM10 as a replacement part, for which you would need to contact either us directly or you local distributor.
We will also have in near future another adapter for 3.5mm to 4.4mm, simpler without cable.
For these 3.5mm TRRRS connectors, it's nothing proprietary, not our creation.
Edit - Found it on Aliexpress:
https://www.aliexpress.us/item/2255800273813075.html
Also, DO NOT make Balanced to RCA cable, that's never a good idea. 3.5mm to XLR could be done.
You can purchase Shanling M0 Pro Adapter if you loose the original from Waltz.
The Waltz is fully compatible with Miracle.
But Miracle itself is still sold with the original XM10.