Well, over at the JP1 site, www.hifi-remote.com/forums/dload.php, there is an upgrade file for a Emerson LC320EM8A_81.    It's probably a good match for your TV.  The TV uses NEC1 protocol, with device 132, subdevice 224.  Using the Lookup Tool available at the JP1 site, we can see that there are only three remotes (of those made by UEI-- probably your DirecTV remote is made by them) which carry this particular protocol/device/subdevice configuration.

They are the URC-10820N  (~$35 internet), URC-8820N (~$25 internet), and the RCA RCRP05B  ($20 at BestBuy, and other stores).  The code is TV 1864.  

All 3 of these remotes carry Cable 1377, which is (I think) the code necessary to control the DirecTV box.

The RCRP05B is a close match in button layout to the RC23/32/64 remotes.

So if I were in your situation, I'd spend $20, and not wait for DirecTV to implement this relatively rare protocol.  Do you have other components to control?  It may be worthwhile to see if a replacement remote can control everything.