How has the system been running so far? I have a fully functioning Razer Blade 15 Hack and was looking at the newer GS66 RTX 3000 system. As a reference you could try running with an updated SMBIOS of the MBP 16,4 (solved some issues with TB and display link output). Also you can utilize alternate Device layout ID's for the sound output. Most blades will work with 11 -22 although for proper 3.5mm jack output I required Layout ID=29, so you will have to try alternate ID layouts. Useful layouts below in teh link.- One USB port next to the Ethernet port not working.
I have an MSI GE75 with i7 10750h and RTX 2070 SUPER