Sure, this works. I actually connect wirelessly to my timers as regular practice. Sending serial data from a timer connected to the photocells via wire is still different than sending wireless data from a photocell at the finish.
Instead his TED, Jim could also use use his MOXA Serial Device Server (SDS) or I could use my Quatech version and connect the SDS to a router with wireles signal. Then you can either connect to the router via LAN from wherever the timer is to wherever the the wireless LAN reaches. If the wireless LAN by itself doesn't have the range you need, add a cantena as John Jett does and get similar range as you would from our TEDs. Better yet open the UDP ports to the internet and use a WAN to connect to a virtual com port through the iternet. My router happens to allow WAN connection through a cell card (USB or Smart Card) so conceivably, I could send the system A data from a timer at any "finish line" with cell service to anywhere in the world. I believe this is the thinking behind the GSM dock that Tag Heuer built for the 540.
I digress, because you still have to have System A and B connected via wire to the finish...at most ski areas, its easier to buy a box of Cat 3 from HD Supply for $75 and run the 1000ft to the finish, or better yet, just time on a trail with wire?
Jenna