HDR is a complex subject. See Wayland color management to appreciate that.
To begin your quest, I would encourage you not to be caught up in the particulars or terminology and concentrate on what scene-referred processing means. The so-called linear processing is a part of the equation. Scene-referred means that what you see is what you get. That is, the output matches the ground truth scene perfectly. Of course, that is rather idealistic and not currently achievable, nor is it usually desirable because your goals and viewing circumstances are different (e.g. you don’t view the world in the same way as computers do; and your room, screen and eyes may change).
True HDR images cannot be displayed on any screen. Compression of tones and colours is a necessary evil to prevent clipping, artifacts and other discontinuities. Surround requires adaptation too. Therefore, don’t be so quick to dismiss filmic and transfer functions. The devs have been hard at work making dt more amenable to HDR workflows; but as I said at the beginning, getting the CMS, firmware, hardware, apps, etc., to cooperate is another problem altogether.
No certain answers because I am not a dt user or qualified enough, in my mind, to speak of the particulars. Good luck.