That's fair. I've seen Korean/Japanese videos where they use this instead of cordial.
(I'm not sure what "cordial" is called around the world, but the sweet mix you add water to. Kids love it especially).
Yep our current batch turned out like a warm version of lemon, lime and bitters. So good! Previously we hand-picked about 5kg of lemonade lemons which were great because their skins are sweet. I reckon cumquat would be great as well.