JJSploit is horrible to use

It's a bit more complex than that. It's not really horrible, at least from my experience. No useful troubleshooting information was given other than "it doesn't inject so it sucks," so no real support can be provided here, and it's especially discouraging when someone says that it's "horrible." Honestly, it was your choice to use JJSploit, so if you don't want to use it, you really don't have to. Lots of alternatives out there. Idk where you're getting the "it simply uses cmd to inject," because that's completely unrelated to the exploit logic.