With such an adapter, the LG UltraFine 5K would only require 11.6 Gbps.
It should be possible to create an adapter that takes a DSC signal like the one used by the XDR and output two DisplayPort signals for a dual tile display like the LG UltraFine 5K (or the Dell UP3218K or the LG 5K2K display or the Acer XV2713K, etc.). You can connect two of those to a single Thunderbolt port. The XDR display uses DSC which compresses the video signal to ≈12bpp so its 1286.01MHz pixels only requires 15.4 Gbps. Each display requires 23.2 Gbps so two of them cannot be connected to a single Thunderbolt port. iiyama ProLite XB2779QQS-S1) that take a single DisplayPort 1.4 signal at 967.01MHz but only up to 8bpc. There's no way you could connect two of them to a single Thunderbolt port - that would require 58 Gbps but Thunderbolt can only do 40 Gbps. An LG UltraFine 5K requires two DisplayPort 1.2 connections over Thunderbolt (two tiles of 2560x2880 at 483.37MHz).
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