Of course, we do not know exactly what OP has in mind - although I note she says she works in many forms of media - but arts and crafts cooperatives certainly are scalable. If that wasnāt the case, how has the the one in a busy shopping centre in this small city been thriving and growing for years?
It has knitting, crochet and sewing workshops, watercolour classes, jewellery-making, silk painting, hand-made flowers, calligraphy, collage, greetings card making and all with a wide variety of goods for sale. Artists also work with children and offer outreach in schools. It also offers creative writing groups, storytelling, digital art and animation classes. It grew from just a few people with a good idea. It is always busy with lots to see, do and buy.
There is another in the seaside town where my MiL lives, smaller but offering arts and craft classes and goods for sale plus food products, cakes, preserves and so.
If you browse the lottery funding website you will find all kinds of arts and crafts projects which have benefited from funding to get them started.
Our volunteer-run arts centre - about 20 of us - has been thriving and growing for ten years and goes from strength to strength. From two back rooms, six enthusiasts and a first year turnover of £5,000, we now welcome around 200 visitors a week and turnover £100,000. All done with hard work and some lottery funding to get us started.
OP says she is open to scale - she says minimum four. She has experience in selling at craft events. Why shouldnāt she aim for something similar?
The key, as I said before, is to get some younger creatives involved too rather than think of it solely as something for older people.