The only current way that i know of is to build a emulator to emulate the widevine functions which in the case of the 4g sram devices would probably run. The issue tho really comes down to, doing so out in the open community i highly doubt is something Google would take lightly.
If one is good at RE stuff and proficient in using Ida Pro there is enough info via researching the Patent Offices to create a working emulator. It also helps if your familiar with how Conditional Access systems work.
I agree with Chewitt says as in time hopefully google will release 64bit version which can be extracted and used as currently is being done. I think widevine will be around for awhile seeing as Googles a major player and companies that big tend to like to keep building on stuff they've already dumped a pile of money into.