If you have all the authors in the Authors field in calibre separated by &s, that information will be sent to your Kobo on the second connect without needing a plugboard. When the book is sent to the device, only the first entry in the .opf file authors list will be used. That's the way I've been using it for years.
This did require me to add sublisting to the send to device template to keep file paths from going wild when you stuff multiple authors into the filename and path.
The send to device template I use is:
Ebooks/{author_sort:sublist(0,1,&)}/{title} - {authors:sublist(0,1,&)}
Ebooks is a directory in the root of my Kobo's
{author_sort:sublist(0,1,&)} simply creates or use a directory based on the first entry in the author-sort entry.
{title} - {authors:sublist(0,1,&)} generates a file name based on the book title and the first entry in the authors list.
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