Could this box (Twin-ISO) work for this application

[DaveParker39]

Anyone have experience with the Radial Twin-ISO?

Looking for a high quality line level isolator that can attenuate.

It looks like it has everything I need, except I wouldn't need to split, just one signal to one signal.

Twin-Iso FAQ - Radial Engineering

 

[CaptainGreen]

I have a Twin-ISO. It is a fantastic line-level isolator, however it does not have any attenuation features. You would need a separate device for that such as a Radial SAT-2, or if you don’t need variable adjustment you could use some inline xlr pads.

 

[abarson]

If I understand your application correctly, the box you're looking for is th LX-2.
LX-2 - Radial Engineering