The apple ones uses a grated apple, but I imagine that a tin of apple would much much the same in the end.

Substituting sweet potato for pumpkin would be good, as its cooked and mashed before putting in the mix.

Non cheesy.... the recipe calls for half a cup of cheddar, but they would be fine without cheese altogether.

I am trying to do some work around my own two grizzlebums now, but I will try to type and post the apple, honey oat, pumpkin and savoury ones if I can. And some sultana ones I make often.