Series 63 can I just register with anyone?

Hello,

about 2 years ago I passed the Series 63 exam, but then never did anything with it.

Now it is about to expire and I really do not want to just let it expire. I found a company that does not pay a base salary, but they say I can register my license with them if I work part time ( I will find my own clients from my home ) as long as I pay for the background check. At the same time I can study for Series 6.

QUESTION: is there a negative connotation or a downside to register your Series 63 license with " anyone " so that it does not expire ?

Any suggestion is very appreciated since I am totally new or even a place or an institution where they register " anyone " since my main objective now, is to register my S63 before it expires ( Nov 2018 ).

Thank you very much.