The existing Swords & Wizardry character sheet is quite basic and also flexible... You can overwrite any incorrectly "Auto-calc" mods that filled in. Can you make it work? It's probably the best one but you can also check out, say, D&D Basic, Labyrinth Lord, Old School Essentials, and the more-basic version of Basic Fantasy RPG sheet. Those all have sheets on Roll20. With a PRO account you could use "Custom Character Sheet" in which you copy the code of the existing S&W sheet and change what you need. Last option, set the Character Sheet to "NONE", and type what you want in plain-text on the Bio Tab, such as: Name Class Strength Intelligence Wisdom Armor HP