Mix wet using blender, I used a hand blender.
Combine "dry with "wet."
Until all incorporated, (don't knead,)gently incorporate.
Cover and leave for 1 hour
3 sets of coil Folds every 30 min combined with stretches.
The dough will not be as light and airy as a white flour only dough because of the rye and Spelt.
When you fold try to fold with air included , if that makes sense ..
Leave on worktop for ⅘hours till visible rising
Commences (don't wait for doubling ) go for 30% to 50% increase
shape up and into banneton then fridge overnight.
Bake from cold in Dutch oven or lidded casserole pot etc.
250C 15 min then reduce to 220C for 40min.