Thanks to all for your contributions. If I am not mistaken, provided pictures have a nice routing but none of them use HF ports for both (main and spare) second stages. And it seems that the only way to connect both second stages to HF ports is the option suggested by rongoodman - here is the picture attached. The hoses seem to interfere with valves, but actually reaching them makes no problem. The length of hoses is ok now, and there still is a HF port left for drysuit if not using argon. Maybe there still is a better way to route the hoses and use HF ports for second stages?
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