Even though the things you are talking about take time and money, we do all of them. Firstly, our trace minerals are terrible, and it takes years to change this when you have heavy clay soil and didn't fix the issue before planting trees (lesson learned). We put down soil trace minerals in the late fall after trees have gone to sleep.
We also fortify the soil with the foliar...seaweed, this year metalosates...fermented and composted teas. My experience of the tree's experience so far is that foliars are more a "just in time delivery" thing, so in early spring around bloom and petal fall whena huge gamuts of bugs and diseases are on the prowl - this is a good time for trace minerals for the tree to defend itself...later in the season they help grow the fruit and the tree to put on new growth. In my 50 some odd years on the planet, minerals always seem to be critical for health, vitamins too, but the Hunzas and other tribes lived to very old ages because of their minerals. Plants seem to be the same somehow, we are all made of the same stardust.
Michael your fermented teas of nettle, horsetail, comfey, I think are brilliant for minerals for both nutrition and disease and can't be left out, we use ones from what is grown here and they help. I saw a poster by Michigan State at a conference which trailed non-aerated compost tea with NuFilm against some conventional chemical for PM and DM in grapes...the tea was just as effective as the chemical.
Anyway I feel that trace mineral supplementation at least in the soil is a long term plan for tree and fruit health, and for disease I have a hunch that foliar minerals may not go away either on our farm.
Susan Fancy
Sassafras Oaks Farm Zone 5 in SE Michigan