Manuscript to comic — locked cast, editable panels, real lettering
Your key stays on this machine and goes nowhere except the provider you pick. Both providers accept reference images — that is what holds your cast together across pages.
Write each character once, give them a reference image, lock it. That image rides along with every page and every single-panel redraw they appear in.
Panels need not be a uniform grid. Build the page row by row — a wide establishing shot on top, three beats beneath, a full-width closer.
Written once, sent with every page and every panel redraw.