That would probably be a very slow strategy because to make an end crystal in a reasonable amount of time. I think the problematic item is actually the the glass because of the ways of obtaining it in a fast amount of time. The fastest way would probably be to spawn right next to a stronghold and a woodland mansion that has the lava room and also it has to be low down, so the player can reach it quickly then get silk touch fast enough to mine the glass and get the 7 glass that you need. The ghast tear and the ender eye could be obtained quite fast just by having a fast way of entering the nether and having extremely good luck. But for the glass you would need a crazy seed to even have a chance of getting any kind of WR using this strategy. If anyone knows of a perfect seed that allows this strategy to set the WR let me know.

Java SE 8 is the oldest version you can use for 1.16.1

But you should just use the latest version (Download link: https://www.oracle.com/ca-en/java/technologies/downloads/)

Great idea. I would love that catefory

There appears to be no category (or runs) for killing all the bosses before 1.4.2 (When the wither was added)

Is it allowed to use 1.3.2 and before in the pre-1.8 category?

That would mean that you would only have to kill the Ender Dragon, but you don't have to go through the exit portal so it isn't Any%