One of the people on the other side of the table here. There are programs out there for the "rehabilitation" of those formerly convicted. Some of what I've seen is probably not helpful for you, but part of their work is job placement with companies whom are cooperative. It's hit or miss who is willing to go through the extra work of hiring those with a record, which is silly because it's not that much extra work. Depending on the role, it does add extra hoops which some managers will just shrug and find someone with less baggage.

Consulting is an excellent other option as well. Plenty of work in the security field if you get your name out there. Independent experts on small limited projects. Especially if you're doing things like external pen tests.