Karabiner Caps Lock to Escape on single press, Caps Lock on press and hold (with delay).

gistfile1.txt

{
    "description": "Change Caps Lock to Escape",
    "manipulators": [
        {
            "from": {
                "key_code": "caps_lock",
                "modifiers": { "optional": ["any"] }
            },
            "to": [{ "key_code": "escape" }],
            "type": "basic"
        }
    ]
}

{
    "description": "Toggle Caps Lock with Control + Alt + C",
    "manipulators": [
        {
            "from": {
                "key_code": "c",
                "modifiers": {
                    "mandatory": ["control", "option"],
                    "optional": ["caps_lock"]
                }
            },
            "to": [{ "key_code": "caps_lock" }],
            "type": "basic"
        }
    ]
}