Tritonus, I don't want to be harsh, but unless you're keeping those things in pots and moving them indoors, or providing protection and heat in the winter, I doing think anything other than hardy citrus have a chance. It's probably better to focus on hardy subtropical plants, temperate plants, and whichever tropical plants do best in pots. 8a in Europe is pretty hard on most tropical plants.
But, I mean, you've still got so much fruit you can grow.
I suspect in your area you can get away with things that die in my summers, like currants, raspberries, apples, Chilean guava berry, luma, and strawberries. That, plus all the other temperate fruits like stone fruit, grapes, goumi, mulberry, blueberries, etc.
Loquat will almost certainly never fruit for you, but it's a pretty evergreen.
Early figs, feijoa, pawpaw, pomegranate, jujube, persimmons, Asian pears, and kiwis are all likely doable. Maybe maypop, that depends more on your summer than your winter, ditto for some hardy citrus. Hardy prickly pear species will be fine in well drained soil, but commercial varieties would need winter protection. Dragon fruit is completely out of the question unless you have a greenhouse and don't mind fighting huge pots with long, brittle, extremely spikey plants that just taste like kiwi anyway.
And then for potted plants, lemon guava is fast and easy, late ripening figs can be given head starts, a lot of citrus varieties can do well in pots, Barbados cherry is very cold sensitive but otherwise extremely easy to keep in a pot, perhaps some Eugenias but I'm no expert on them. Be careful of plants that are nearly hardy, but get huge before fruiting like guabiju and hardy bananas. Those are perhaps better in ground and just very well protected.
