FWIW Billy, I took your nod to be just that, a friendly biker's nod
This was the whole point of changing it from a wink to a nod, so that folk just looking to make friends could acknowledge each other...
It does serve a dual purpose, as it can still be used as a "wink" and an "I'm interested in you" signal, but as soon as you get chatting, it's fairly obvious which meaning was intended
I don't think you have any cause for concern however, Billy - you've not been brash at all - and it seems your plan to get to know a few folk before returning to the UK has worked a treat