Marie, I missed the long useful post, but one easy option is to divide things, or buy perennials, but keep them in pots in the shade to recover, and then turn that area into a potted plant highlight. You’d need lots of pots, but for me it would be easier than trying to plant in the ground where you can’t control sunlight. At least with pots you can keep them close and easy to water after division. I have several hostas in pots mainly because I haven’t figured out where to put them and I figured they might as well make the house entrance pretty in the meantime! Here’s an example that I just put together yesterday. I bought these small golden ferns as houseplants but have not planted them. Stuck them in a pot with extra annuals that didn’t fit into other annual arrangements. These astilbes were given to me by a friend and I don’t know what to do with them yet. Hosta in back in pot, waiting for its place (who knows?), begonia that serves as houseplant in winter, Gold Heart Dicentra. It was absolutely dumb luck that the red color of the astilbe perfectly match the annual with the ferns. In fact, I didn’t even notice it until yesterday when I put together the arrangement. Anyway, long way of saying pots might be easy. The astilbe are in standard black garden pots, which you could easily hide behind prettier pots.
Q