Second update.
Dwarf Namwah is quicker to recover than i thought, showing on the most advanced stem already 2 leaves, and putting out the third. By comparison, the plants (dwarf namwah) that i overwintered by uprooting them haven't put out not a single leaf yet.
At this point i can say that every stem has resumed its growing, but the growth appears stunted on every stem. I think i will take about a month before i can see new healthy leaves.
At the moment new leaves are almost white, probably due the damage of cold temps. The leaves of the stem at the left of the picture have problems unfurling.
Stems are way less thick than when i started the overwintering and i don't know how this will impact flowering/if it will impact flowering. However they shed all the dead layers outside and the appear reasonable healthy for the season.