You are correct that you won’t receive aid for an undergrad degree. You already have one. If your CC has an articulation agreement with UMD, then work with the Transfer Counselor at your CC and with the Transfer Admissions team at UMD to make certain you finish whatever it is that you need to finish with the GPA you need.
While you are at it, don’t forget to look at the various engineering programs at Frostburg, Morgan State, UMBC, and UMES. One of those might be easier for you to commute to than UMCP.
Save your money for grad school.