No. A decorative cap can be only the visible finish, while the bellows, tube and switching components perform separate functions. Identify which part is actually damaged before ordering a colour-matched accessory.
What the observation tells you
A replacement cap will not necessarily resolve intermittent operation or water entering a damaged button assembly. Equally, a cosmetic change should not require improvised alterations to the control system. The approved parts and removal method depend on the exact accessory.
A useful next step
Use the manufacturer's diagram and compatibility information. If operation has changed, request fault assessment rather than assuming that the visible surface component is the cause.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.