Saving and loading class member variables without temporaries

I have a class for which I would like to save and load specific member variables. Currently I do it as follows:

% save member variables
var1 = obj.var1;
var2 = obj.var2;
var3 = obj.var3;
save(filename,'var1','var2','var3');

% load member variables
obj = MyObject;
mvars = load(filename,'var1','var2','var3');
obj.var1 = mvars.var1;
obj.var2 = mvars.var2;
obj.var3 = mvars.var3;

The '-struct' option appears to have been added so that this can be done with structs, but it doesn't work with classes (despite it being the same notation). Is there anyway to do this without creating all of these temporaries?