There's no need to profile a DI-box. Simply create a patch with amp and cab disabled. You may disable the entire amp-section, except you may want to use the EQ. I run all my string-instruments through the Kemper.
Welcome @Jimbobbley.
There are profiles in the stock rigs, named Acoustic A-D, that should be suitable for a Banjo.
Except for Banjo's are forbidden instruments.
SCNR. 
simply make a Profile of a patch cable.
it will be completely transparent, but offer you access to a few cool parameters like Definition and Compressor.
simply make a Profile of a patch cable.
it will be completely transparent, but offer you access to a few cool parameters like Definition and Compressor.
Don is right - the parameters that become available in the Amplifier section when you make a profile (even if it is a profile of a patch cable) are very useful.
There are a couple of AER 60 profiles on the Rig Exchange which might suffice. They certainly sound like my AER 60 - full range and neutral, as designed for acoustic instruments.
It works for Hans Zimmer.
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I would recommend "Yamaha THR10" Aco or flat from Costa in RE
Surprising basic profile for acoustic instruments.
I use it for Ukulele and acoustic guitar
