Gloriosa superba, exactly!
Swan River Daisy can withstand a lot of sunlight, as well as phlox (both are great for pots).
Zinnias and dahlias...
There are miniature climbing roses around, google them. They're not as majestic as the big ones, but they're cute.
Pansies and delphiniums, one easy and available, the other not so much...
I think the first one is a hybrid: Gasteraloe (Gastera x Aloe).
Bulbs are very easy-going as for transplant, (at least when the leaves are still young),but be careful not to break the stems, or the bulb is lost. Keep the pots in a warm place and the stems will sprout. Freesias are truly not hardy; wait until the last frost and move the young plants to their definitive place. (By the way, I have some now sprouting in a pot, I love the smell of their flowers!)
Not fast enough again!
Cerinthe major purpurascens, aka blue honeywort.
For this summer, buy some plugs: bidens, brachycome, ivy pelargonium, phlox, gentian, prunella, even carnations. For some tall foliage, try somedwarf cordyline or some manageable grass, like anemanthele or blue fescue.