But it must be possible to set wholesale prices using the special prices option in the price tab in backoffice. There you can set what group and from what number of products it is valid from
I always use Google fonts to be sure that they exist. But that must probably be handled using css and the editor will only show what you have on your computer or...
I used a module that used xls. Then you never had to bother about separators. But ofc the importer must be built for it. Mine could use csv xls and xlsx