I agree and submitted the question to the maryland529.com folks shortly after posting here.
I received a prompt response that I'll share here:
"You and your spouse can each open an account for the other and apply for the Maryland State Contribution Program. There is currently no prohibition from rolling the funds to another beneficiary after they have been received.
State contributions are not guaranteed. The state funding for contributions is limited to $3 million in fiscal year 2019 and each fiscal year thereafter. As with the entire state budget, the Maryland General Assembly has final approval. If resources are insufficient to fully fund all eligible accounts, Maryland 529 shall provide contributions in the order in which applications are received in good order and give priority to applications of account holders who did not receive a state contribution in any prior year. If you receive a state contribution for any account in a given year, you are not eligible in that year for the income deduction on your state taxes for contributions that you made to that or any other Maryland College Investment Plan account. You should check with your tax advisor regarding your specific situation."