The new NVIDIA Frame Limiter natively supports any frame rate value. It's exposed in HEX in NVIDIA Inspector. Here is XCOM 2 capped at 30fps. You just need to convert your target
MEGATHREAD: FIX FPS Drops & Stuttering for SMOOTH GAMEPLAY in Fortnite : r/FortNiteBR
Comprehensive benchmarking of NVIDIA's FPS limiters (V1, V2 & V3) vs RTSS vs In-engine: A research of their frame time consistency and approximate input lag. : r/nvidia
How To: Create Custom FPS Limits in Inspector | Overclock.net
Reducing screen tearing and input lag | by Chia Wei Ong | Medium
NVIDIA's New Control Panel FPS limiter VS Rivatuner VS In-Engine | guru3D Forums