Wifi Transmitter to WEP

I am wanting to use a older device that runs on WEP settings with my new router, as my old one went out on me. My new router, however, does not support WEP. I read somewhere that a guy bought a transmitter that takes your normal settings and brodcasts it as WEP. However, I cannot find anything like that online. Is this a thing, because I thought all hope was lost, and I really want to connect to wifi with it. Anyone know of something like this?

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I wouldn't run WEP on your network. It can be cracked in under 2 minutes for starters. If you watch my WEP video with me explaining. Then that should sway you. What device do you want to run on wifi that only supports wep?

DS Lite (I know, old technology :P)