There is nowhere to start with that but lets give it a go.
We don't have EU regulations on the size and shape of fruit that we eat, in fact many of the standards are imposed by supermarkets because consumers don't buy mishappen looking goods. This won't change if we leave the EU.
Seasonal eating is fine, but this isn't the 1950s and you'll find that lots of people have become used to the choice that they have and will still demand it. Leaving the EU will not effect this.
The African nations thing? Well it appears to be based on some misplaced sense of philanthropy, these are also complex deals which take away from your other points. African nations also aren't just sitting waiting for us to start trading with them, they are already sending their produce to other countries with contracts to fulfil to do so. Your point about foreign aid is worrying.
Exports all over the world? What would you like us to export? If hard Brexit occurs many of our manufacturing bases will move to the continent and without passporting access for finance we will lose one of our major exports.
The foriegn ownership is nothing to do with the EU either.
Farm subsidies are unlikely to change, look who is in power but again the CAP was due to change and be administered by national governments from 2020, so that change was coming anyway.
So most of the things you want aren't to do with the EU, or not made more or less possible by leaving.
Great.