After years of research (and several not-so-successful attempts) we've got the answer for large large format processing: the SP-8×10! Simple: No frames/holders to fumble with in the dark. Just take
Color Processing and the Thermal Profile of the SP-8x10 – Stearman Press LLC
SP-2810: 8x10 film processing system – Stearman Press LLC
SP-8x10 Daylight Processing Tray for 8x10, 5x7, 4x10, 4x5, and 9x12cm
Photographic Supplies – Stearman Press LLC
Creating the Stearman Press SP-8×10+ film development system - EMULSIVE
Stearman Press LLC
Photographic Supplies – Stearman Press LLC
Stearman Press LLC
Foilcraft Junior (Package 1)
SP-8x10 daylight processing tray – Stearman Press LLC
SP-8x10 Center Divider – Stearman Press LLC
SP-8x10 Daylight Processing Tray for 8x10, 5x7, 4x10, 4x5, and 9x12cm
Stearman Press SP810 8X10 developing tank system - Film Processing Equipment - Firstcall Photographic Ltd
SP-8x10 daylight processing tray – Stearman Press LLC