The best cheap option is to shave the a-frame, as the pinned gas block will be very secure.
Next up is sending it to a good shop to have a pinned low profile block installed.
Short of that, use a set-screw type gas block with the barrel under the set screws being dimpled so the gas block won't walk forward over time.
Never argue with an idiot. They will drag you down to their level and beat you with experience.