actually there is. there is a console tool from microsoft called "devcon" which can restart any device in your pc. you should be able to control it via mpstandbyhandler external commands.
as long as there is a 64bit version of devcon, that's exactly the way to go. afaik only the hardware restart option of mpstandbyhandler is affected, the rest should work. not tested though. good luck!
Normally ia64 should work on x64-machines too, doesn't it?
rem this disables your TV card. find out the hardware ID of your card in device manager properties . the asterisk is a wildcard
devcon disable "PCI\VEN_1822*"
rem give it some time thats why I use ping localhost before next command
ping localhost
rem next enables your card again
devcon enable "PCI\VEN_1822*"