Are you people certain you need to bother with HDCD? In my opinion that tech has always been dead. For example that Van Halen album shown in Defender's screenshot doesn't seem to use any HDCD features: https://hydrogenaud.io/index.php/topic,61731.msg551062.html#msg551062. If that's the case, it will just be quieter when decoded with HDCD component, or with the volume boost enabled it will be identical to non-decoded one.
This Van Halen HDCD only has transient filter upon playing. I'm not listening to it.
I stick to the Rhino 2015 HD remasters.