Question for all - mixed security in our network

We have a network withthe following components:

1-Cable modem
2-Netgear FVS338 VPN Router
3-Linksys WRT54G V6 serving as a wireless access point
4-Linksys WRT160N serving also as a wireless access point
5-Linksys RTP300 VOIP Vonage phone interface

Both the WAP's use WPA Personal-TKIP.

I have a Linksys Wireless Media Adapter that I can use to play
music, view pictures, etc on a TV. It currently is connected
via CAT5 into the Netgear VPN router and is only in 802.11B mode.
I would like to move this adapter upstairs to my wife's TV/theater
so she can listen to music and showw off the grandchildrens' photos
to anyone who will watch. (The music and photos are stored on
one of the wirelessly connected computers). I don't want to
run a wire up to her TV area, so will use the wireless feature of
the media adapter. The problem is the `media adapter only can
connect wirelessly using WEP - which because of my wife's business
is not acceptable. She has client confidential data on this network,
and to change all wireless to WEP will pose an unnecessary security
threat.

I am proposing to her the following: I have a Linksys WRT54G V2
router that is running TOMATO firmware. This is currently an
experimental unit that I work with to learn more about alternate
firmware, and is not connected to the network. I would set up this
router to be connected to the Netgear VPN router as a WAP and
use WEP access and MAC address verification so that only the media
adapter would be able to access the network and no one else could.


Does this sound reasonable and Will it work? What am I getting myself
into here?

Your suggestions, criticisms are welcome.

John Carter