If a downloadable version was available, I would download it immediately. It’s always nice to feel that you “have” something of value among your files (and can play it offline any time you like) and your game is very valuable for people who like JSW and ZX Spectrum games in general .
Yes, I think you could do JSW in two minutes: load a game (e.g. the 2015 Bugfix Edition) into JSWED, convert it to JSW64 and tick the 'No Kamikaze' feature for each room . This would leave you with a 128K file, of course.
There was a significant update of JSW Central on 3rd December 2018. I had worked hard to make it happen and I did mean to announce it later, but a whirlwind of real life activities prevented me from doing it. I would now like to mention it for the record, although I will probably not describe all of the changes as accurately as I would have done in early December.
The main change was the launch of a new section: 'Versions and minor mods of the original Manic Miner'. Apart from its main page, it features 18 individual sub-pages for each discussed variant (in one case - variants, where a few very minor hacks are discussed together), with general info, info about the completability of the game (or lack thereof), download links and a screenshot gallery, illustrating new elements / differences from the original MM. Over 350 new screenshots related to this section were added to the site.
There were also various other improvements, such as switching to HTTPS, the addition of individual pages for "Manic Miner: Back to the Mine" (by LiganTM, 2018) and "Manic Mixup" (by Ian Rushforth and Andy Ford, 2018) to the Manic Miner games section, the addition of information about "JSW 128 VK3" and "JSW 128 VL5" (both by Norman Sword, 2018) as well as "Thoroughly Modern Willy" (by Bob Fossil, 2018) to the "Games of MM and JSW interest" section, a Chronology update, etc.
I am now going to move on and start adding individual pages for the JSW games listed on the main page of JSW Central.