@Jake Lo @Hervé
I rebuilt the entire flash drive with fresh Catalina, Clover_v2.5k_r5098 (earlier 5093), ACPI and kexts ( Hervé's post) and config.plist (dennisc's post) with NVMe patch (Jake's post)
Now Dell restarts after
** In memory panic stackshot succeeded ** bytes traced 17184 **
EFI.zip