This should explode in multiple ways. Let's see.

src/graphics/eink/Drivers/EInkParallel.h

@@ -0,0 +1,69 @@
+/*
+
+Parallel-EPD niche driver, backed by FastEPD.
+
+Used for boards with an 8-bit parallel EPD interface (e.g. LILYGO T5 S3 ePaper).
+The base class signature passes SPI parameters; this driver ignores them and uses FastEPD
+to drive the parallel bus directly.
+
+Gated on NICHE_HAS_FASTEPD because FastEPD is a heavy dependency that only parallel-EPD
+variants want pulled in. Variants opt in by defining NICHE_HAS_FASTEPD in their platformio.ini
+and adding the FastEPD library to lib_deps.
+
+*/
+
+#pragma once
+
+#include "configuration.h"
+
+#if defined(MESHTASTIC_INCLUDE_NICHE_GRAPHICS) && defined(ARCH_ESP32) && defined(NICHE_HAS_FASTEPD)
+
+#include "./EInk.h"
+
+#include <atomic>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+
+class FASTEPD;
+
+namespace NicheGraphics::Drivers
+{
+
+class EInkParallel : public EInk
+{
+  public:
+    EInkParallel(uint16_t width, uint16_t height, uint32_t panelType, uint32_t panelClock = 28000000);
+    ~EInkParallel();
+
+    // SPI parameters are unused for parallel panels.
+    void begin(SPIClass *spi, uint8_t pin_dc, uint8_t pin_cs, uint8_t pin_busy, uint8_t pin_rst = -1) override;
+    void update(uint8_t *imageData, UpdateTypes type) override;
+
+    FASTEPD *fastEpd() { return epaper; }
+
+  protected:
+    bool isUpdateDone() override;
+    void finalizeUpdate() override;
+
+    // Hook for boards that need to bring up GPIO expanders / power pins after FastEPD::initPanel.
+    virtual void postPanelInit() {}
+
+  private:
+    void copyImageInverted(const uint8_t *src);
+    static void asyncFullTask(void *param);
+
+    FASTEPD *epaper = nullptr;
+    uint32_t panelType;
+    uint32_t panelClock;
+
+    UpdateTypes pendingType = UpdateTypes::UNSPECIFIED;
+    std::atomic<bool> asyncRunning{false};
+    TaskHandle_t asyncTaskHandle = nullptr;
+
+    uint8_t fastRefreshCount = 0;
+    static constexpr uint8_t FULL_SLOW_PERIOD = 100;
+};
+
+} // namespace NicheGraphics::Drivers
+
+#endif // MESHTASTIC_INCLUDE_NICHE_GRAPHICS && ARCH_ESP32 && NICHE_HAS_FASTEPD