One idea but, highly unlikely the landlord would agree, is dropped kerbs and 2 rows of slabs going across the lawn. However, the cost burden would most likely fall on you, unless there was any chance of a grant such as a DFG.
The other option is something like Kerbocharge across the paveent but, then Ohme will highly likely reject installation, due to the distance from your bungalow to your car. Even if your landlord agreed to a post to mount a charger at the bottom of your garden, it would fall under a non standard install and no cheaper getting a charger fitted yourself but, putting the cost burden on you again, which you don’t want.
Landlords have to make reasonable exceptions for the disabled, alternatively have you thought of asking the forces charities for help?