The 64 bit requirement is only for development purpose. I’m developing an HTML5 project and it works like a charm on 32 bits. The trick for 32 bits is to enable the gzip compression. I normally pre-gzip nearly all large files (I host them in an Amazon S3 instance with CloudFront) to be able to serve them to a 32 bit browser.
The only drawback right now is that you have to use a GitHub build for it to work. Then it’s just creating yourself some scripts to automate the processes, it shouldn’t take you more than a few days of work.
Epic just released a demo of their StrategyGame for HTML5 and it works on a 32 bit browser. The whole workflow might be experimental but I had 0 issues with it so far.
I added a small guide on one of my answers about what I’m doing do perform a HTML5 build (Html5 build issue - Platform & Builds - Unreal Engine Forums ). The whole process can be achieved by calling the RunUAT build scripts (just check the UFE output log to check which parameters to use).