So there’s the Chantodo Vyr build. I think Chantodo Vyr’s with Messerschmidt’s Reaver in the cube will be the closest to what you want.
You can’t achieve 100% Archon uptime, but you can get very close. The downside is that you need to stack up Chantodo’s out of Archon. So generally you want to be out of Archon for 4-5 seconds to do this.
This isn’t totally necessary for lower level content (T16 rifts and low GR speedruns) you can run Messerschmidt’s Reaver in the cube to get your Archon cooldown reset pretty much instantly and then just ignore your Chantodo’s stacks and enter Archon right away. Although I’d generally recommend getting a quick 5-10 stacks. This setup falls off for higher difficulties though, as eventually you start needing the full 20 Chantodo’s stacks to kill stuff.
Here’s a quick video guide that Lexyu made a few seasons ago that might be helpful. It’s pretty short, but it covers the essentials. The starter build he talks about should work well for both T16 and lower GR speeds.
