Splitting 240v circuit vs Y-adapter
I think option two is better, and not that hard. Use a RACO 187 extension box https://platt.com/platt-electric-supply/4-Square-Boxes-Accessories-Extensions/Hubbell-Raco/187/product.aspx?zpid=0052108 . Option 3: You could have a qualified person replace the two pole breaker with one 30 and one 20 amp breaker with handle ties and use one L5-30 and a 5-15 or 5-20 with the above 187.