The width will likely limit choice. Dacia Jogger 7 seat 1784mm not including exterior mirrors
Which is the only one that comes within the OP’s width parameters (assuming mirrors have been discounted). However it doesn’t have the sliding rear passenger door the OP also requires.
To be honest, I am struggling to think of any vehicle (on or off the scheme) that meets the OP’s full requirements when width, passenger/load carrying and sliding rear passenger door are taken into consideration.
OP – Is there any chance of changing your wheelchair to a compliant ‘drive from wheelchair’ one?
Or perhaps trying to snag a wider or ‘end space’ in your car park?