What doesn't appear to get detected (yet) is to photograph your contact details, and send them as a message attachment.
I was about to suggest that as I read your reply.
The 'bot' can only scan looking for the programmed key-words.
A photograph of the item for sale with your email address propped up alongside it gets thru' every time.
Mine are not the best, but they are not too bad. I can think of lots of Enfields I'd rather have but instead of constantly striving for more, sometimes it's good to be satisfied with what one has...