How is the soil? I have a similar situation, where I have astrantia, pulmonaria, actea, hardy geraniums and snowy woodrush, Luzula sylvatica. (Loamy well drained soil, with a decent amount of humus).
"What is hateful to you, do not do to your neighbour".
I have Fuschia, aconitum, clematis, phlox panticula seem to cope OK, brunnera, also a salvia Nachtvlinder. A lot of plants can cope with less sun than recommended but it's handy to have a sunnier spot to move them to if they dont thrive
Japanese amenones for later in the season. Aster 'Twilight', though it does run, Aster divaricartus (Eurybia divaricartus), Liriope muscari, Lamium maculatum, Welsh poppies.
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A lot of plants can cope with less sun than recommended but it's handy to have a sunnier spot to move them to if they dont thrive