Hypex Nilai: Is it possible to bypass the onboard input buffer?

After much consideration, I have decided to use the Hypex Nilai platform for my new Class D amp. I was wondering if it’s possible to bypass the internal input buffer or if this is even a good Idea. I believe that they use a type of differential circuit, I probably don't want to mess with this. I will be using a Silver Rock passive TVC preamp and will most likely need more than the 29dB of gain that is offered on the board.

My idea is to use a tube (or discrete op-amp) buffer and gain which will allow for over 30dB of total gain. Is this a good approach? having 2 buffers does not seem to be the simplest solution but bypassing the internal buffer may not be possible or recommended. Any ideas?

Thank you, community!

G