First, I get the feeling you're looking for a quick fix. Have you ever tried CBT? A 'herbal' option wouldn't be any less 'cheating' than propranolol. They both chemically alter your mental state to be able to help you cope, and if you consider that cheating, they they both are. Personally, I don't consider it cheating - if you need them, you need them. I don't need them, but does that mean I'm cheating by having a fortunate brain chemistry that means I don't?
Anyhow, onto the whole herbal thing. To be honest, I've never understood people's fascination with 'alternative' herbal remedies. Alternative is generally a euphemism for 'rejected by mainstream medicine because it doesn't work/has more side effects than other options'. The second an alternative remedy is shown to be safe and effective, with fewer side effects than conventional medication options, it ceases to be alternative and becomes mainstream medicine. Take Senna laxatives, for instance: they're herbal, but are mainstream medicine rather than alternative medicine, as they work and are safe.
Other herbal medicines, however, have not been tested to the same extent as normal medicines: they haven't gone through tests to ensure they work better than placebo; not as much research has gone into potentially dangerous interactions with other medication; the long-term safety is unknown. Legally, they don't have to be subjected to such testing, as they're made from plants. So, really, when you take a herbal medication, you're taking part in a drug trial. At best it will have a placebo effect; at worst, it could make you quite ill or have potential consequences in later life. Just because it's from a plant, it doesn't mean its safe - there are plenty of dangerous plants out there.... As I said above, if it was better than placebo and was safe, it would be conventional medicine, not alternative, and you would be able to get it prescribed by your GP.
So, are there any herbal options? Ask your GP. I suspect, though, that your occasional propranolol usage is the safest bet. If you ask a herbalist, they'll probably give you something, but who knows whether it's safe or effective - they're trying to sell you something, after all.