...retired ones are known to work at soaplands (don't know if they still exist?) or cabarets and strip clubs.

Check out this site below.  It's in Japanese so you'll have to translate it in English.  I know Maria Ozawa used to post on that site.

I am an American who has lived the past 11 years in Japan and I hate to have to tell you this, but...

A big problem you are going to have getting into any high end place is the language barrier (if you can not do at least basic conversation, forget about it unless you have an introduction from a club member) and the fact you are not Japanese (I am assuming the last, but many of the best places won't let you in even if you speak Japanese without being Japanese). You will be able to get into low end Japanese places and the Chinese and Korean Estes with just basic Japanese, but do not expect to even get in the door to the high end places without a little luck.

If you are here on business, your best bet is to casually bring the subject up with a Japanese co-worker who you think might be into the hobby as well, and see if he will give you an introduction to the shop. Even with poor language skills, an introduction can get you in the door because you have been vouched for.

Also, make sure to get a membership card so you can get points for service discounts (no kidding, my favorite shop gives me a ¥10,000 every 5 visits) and it is a ticket into the shop next time you visit. If you have the card, you must know the rules.

I have been lucky enough to see a few AV girls, and they beat the hell out of the PSEs I have had in the States. Even as a Pornstar, a lot of them have never been with a Westerner, so they are curious to give it a try.

From my experience mongering in Japan, forget it. Go somewhere else. It's not worth the hassle.

Here is a great site with lots of info for Gaijin (non Japanese) Welcome places, i wish i had known before i went.

http://erolin.net/

You might find something on there you like.

Good luck over there.

a number of av models do escort. But they don't seem to do it in japan. Check the "backpage.com in the major us cities and you will find one or two from time to time.