Best Fruit Bearing Shrub Cultivars/ Nurseries

I'm searching the web for superior cultivars of the following shrubs: Black Currant, Aronia, Elderberry, Blackberry, Raspberry, Hardy Kiwi, Seaberry.

Some of these varieties are limited in cultivar selection so I know for the most part what to get (i.e. Aronia and Elderberry).  There's a nursery/breeder by the name of Lubera in the UK that breeds insane looking black currant (Blackbells for one) but I don't know how to get them stateside... Can anyone recommend nurseries and varieties of any of the above mentioned fruit?

Noteworthy: This fruit is for use in our brewery's spontaneously fermented wild ales.  So yield and flavor intensity is desired.  We will be planting varieties in 300' rows, among beehives and other various stone fruit tree's in a spread out permaculture style orchard.  

Lubera are an excellent company with some interesting varieties. Unfortunately for me they are based in Switzerland not UK, and no longer ship to the UK after Brexit at the moment. I did get some nice things from them, a bit expensive, but very good healthy plants for anyone in mainland EU.

I'm afraid I can't help with stateside recommendations for nurseries however, except to refer you to the seed and plant review page here.

I have Boysenberries and Loganberries from the farm my parents bought in 1943 that produced wine from them.  I can deliberately produce tip roots to propagate them.  They each have distinct strong flavor and fragrance.  There is also a wild black raspberry with aggressive thorns and seedy berries but makes the best flavored extract. See Qberry Farm in signature line.

Burnt Ridge Nursery here in Washington state has some excellent cultivars of all of those fruits. They really focus on flavor at their nursery. I went on a farm tour before COVID and they had a fruit tasting at the end of it.... YUM!
I can't remember the names of the varieties we bought off the top of my head but we have a black currant, seaberry, elderberry, and Aronia berry from them that are all delicious, (except the seaberry hasn't fruited so I don't know about that one yet). Our favorite berries from them are actually golden raspberries, goumi berries and two different Autumn olives.
https://www.burntridgenursery.com/
They pretty much propagate everything themselves onsite and so they are very knowledgeablev about all their plants. If you call or email them, they are very willing to give advice about what varieties work best for what you are looking for.

Also I've heard wonderful things about One Green World in Portland OR. https://onegreenworld.com/
They have an overwhelming amount of cultivars of all the fruits you are looking for. I haven't personally bought from them but I keep drooling over their website and making wishlist.