You’re likely trying to make your stairs safe without committing to permanent construction or drilling into walls. I selected railings with clamp-on brackets, tension posts, and freestanding bases in neutral metal and wood finishes, all easy to install and remove cleanly.
Portable Safety Railing Systems - Temporary Guardrail, Non-Penetrating ...
Temporary Handrail For Stairs | Stair Designs
Adjustable Side Mounted Stair Handrail Kit
Surface C50 - Outdoor Stair Railing, Easy Install Handrail | Simplified ...