Your p411 username will have your real first name and state in it...  or something. (City?)

I would just let the woman know when you email that your p411 is such and such and your TER name is Chestnut2011

Example:

Dear Sexy Escort I'd Like To Sleep With,

Some introduction about yourself here and then some flattery in regards to her photos or website content. Your photos are very fetching blah blah blah I too love french cuisine! Mention dates you are looking to meet with her, and how long an appointment you'd like.

For screening purposes I am a member of P411 my username there is JimS_2938. I have a few "okays" there from other providers. I also am active on TER, my username is Chestnut2011 and I have been Whitelisted by several providers there. Please let me know what further information you need for screening.

Blah blah blah

Take care,
Your new favourite and easy to screen client.