Sorry, someguyonearth, I keep forgetting to cut thru the Sony BS when I read the feature list: they do claim it can make SD transfers of HD camera video, but bury the fact it can only do it via composite line inputs (not directly off the card files or off the camera HD output).
The Japanese home-market BluRay models would be your best bet for a conversion feature, but there were countless models and I couldn't begin to tell you which would do what you want (and you'd need a translator to get thru all the Japanese tech speak, there's almost no info on those models in English). I can't imagine they would be any faster than a PC, tho.
The European models were mostly Panasonic UK, the early ones were better but were quickly replaced by feature-starved models optimized for satellite recording and not much else. Adapting to North American use would be tricky and they are virtually impossible to import due to mfr/dealer/region restrictions: about the only way is to travel there, buy one, wrap it in a plain box, ship it home, and pray Customs doesn't open it before it arrives at your door (they're also technically illegal here because of the foreign tuners).
You might try researching the tunerless semi-pro/industrial JVC SR-HD1250US Blu-ray Disc & HDD Recorder
, sold thru USA pro photo dealers like B&H. I don't have the downloaded manual handy or I'd look up the feature for you: the manual is downloadable if you go to JVCs website. You'd want to be sure this unit can do the conversion you need as quickly as you need, because semi-pro dealers don't easily take returns or give refunds on this stuff. According to JVC's spec page:Built-in format converterWhen standard definition copies are needed of original high definition material, the source footage is downconverted and then recorded to inexpensive DVD discs. Even complete Blu-ray™ HD projects can be recorded in SD for clients who may not yet have HD playback equipment.
I think you're kinda stuck with the PC: you may need to get the fastest i7 laptop you can afford and explore faster conversion software. I doubt any available dedicated recorders will do these conversions faster than a new PC. And with a recorder, you're held hostage by the proprietary DRM-enabled burner idiocy: they aren't meant for heavy duty use, they croak faster than anyone expects, and replacements cost as much as the whole recorder (if they even bother to make replacement parts).