How about creating an "official non-union" to publish a reasonable list of benefits that employers should expect to offer in order to attract and retain good employees. Workers could voluntarily sign it like a petition to demonstrate mass support and companies could voluntarily comply to generate positive publicity (the carrot) and to aviod unionization (the stick).

Isn't it an interesting coincidence that in SQL we have UNIONs that JOIN together various members to generate a RESULT.