If you are convinced that you want to use a single helmet for climbing and skiing we highly recommend you use one certified for both skiing (EN 1077) and climbing (EN 12492 / UIAA 106) as of this writing, this includes the CAMP Pulse , CAMP Speed Comp, Cebe Trilogy, Grivel Duetto, Kong Kosmos, Mammut Alpine Rider, Sweet Protection Ascender Mips, Sweet Protections Igniter Alpiniste, Salomons MTN Lab, and soon, the Grivel Duetto

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Answering those questions will usually point you towards the right hook
K1 Pro Helmet - Snell SA2020 (SA20) Rated The K.1 Pro is a multi-use, full-feature helmet with superior ventilation, Aero styling and Bells aggressive chin bar design and front chin gurney (Duckbill)
The sink rate is chosen based on how deep the fly needs to be throughout the retrieve