Diablo 4 does not let you log in directly through the client anymore, you just need to use the launcher, which does not stop you from launching multiple Diablo 4 clients. You do not need any software or tricks to launch multiple Diablo 4 clients through battle.net.
What rules are you thinking you might violate by using software with Diablo 4? Blizzard's World of Warcraft rules apply only to World of Warcraft -- input broadcasting is absolutely not prohibited in any Diablo series game. WoW is the only Blizzard game where they instated have such a rule.
Many people are using ISBoxer with Diablo 3, 4, Diablo 2 Resurrected, and Diablo Immortal, in fact MiRai made a video series from the Diablo 4 beta --
https://youtu.be/oXREI8KgCfQ
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