What You Must Build to Replace JUCE with iPlug2 + Dear ImGui + NanoVG + Faust
Replacing JUCE with iPlug2 + Dear ImGui + NanoVG + Faust is architecturally viable but incomplete: the four-library stack covers roughly 60% of JUCE's functional surface. The remaining 40% — parameter lifecycle, MIDI, audio-to-GUI threading, and build/signing — must be built as a thin glue layer of eleven purpose-built components totaling about 24 developer-days. A subsystem-by-subsystem gap analysis, capability matrix, data-flow diagrams, and an implementation roadmap.