How about create a systemsettings5 module for Kvantum or simple adapt it and merge the source-code of kvantum-manager into "application style" configuration section?
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I'm pretty sure the Kvantum developer isn't interested in upstreaming Kvantum. Besides that, opening the Kvantum settings window from here should already be possible if it's implemented as a KCM, or wrapped in one when installed on a Plasma system. You'd want to talk to its developer about doing that. The ball is in his court right now.