vegs cannot replace the quality of the grass, I think. And I am not confident of the vegs themselves... they grow up with chemicals, have a lot of residual toxic substances... the grass is always natural and organic; if the lawn is not safe I would wash it with the product for washing vegs, but I can be sure that grass is only rich of minerals well balanced for a piggie's needs... I remember so many safe gardens in UK, private and public... and your climate is so good for grass.
Anyway, in my district there are private lawns around each building, gardeners use only water.
Each day I feed my two piggies with a bag of grass and a piece of bell pepper and some slices of cucumber which now is very cheap at the market. Here vegs cost 1-2€/kg... and a pig if does not eat grass gets 80-100g of vegs a day...
it is not a huge sum.
For these months my piggies have been eating only grass and a little piece of some veg. This is the grass picked up yesterday, this is my famous "grass-bag"! I put the bag well closed into the fridge, so that the grass keeps its freshness during the whole day.
My advice is feeding our herbivore pets with grass; just a short walk or a fast drive to some good private lawn and the meal is served
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View attachment 66188