Ahh, my mistake; shouldn't be too difficult to do so, though. Might just need to add an identifier pre-fix to the listing tags from the listing event to make them readable as hashtags rather than solely as listing tags.
Discussion
Npub.pro doesn't support classified listings atm, but as I'm looking into it that shouldn't be too hard to add. Checkout etc are harder, but we could start by just showing the listing properly.