I have a flat 13" (actually a little less) Motolita on my car and have no issues with switches. Maybe something you need to get used to. To change the length would be a considerable undertaking even if there was a shorter one available.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone