I say this with all due respect. You state that you live in Maryland and you know the law in your state but you are still asking for a way around the magazine capacity limit law. Why would you ask on a public forum if you already know the laws in your state? I'm not familiar with Maryland laws myself as I've never lived or traveled there.
Finding legal advice online can be risky and possibly get you in serious trouble. Looking for a way to get around local laws is a recipe for disaster. My advice would be to join and speak to your local Pro 2A organization about the legalities for your state regarding your questions in relation to the most up to date firearms laws and upcoming legislation.
Btw welcome to the forum.