Planewave

We do not know the positions of the bore holes of all Newtonians, but please take a look at the technical drawing of the Versa Base which you can find in the Download-section of the product page of the Steeltrack, or directly at https://www.baader-planetarium.com/de/downloads/dl/file/id/30/product/2859/bds_nt_dimensions_technical_drawing.pdf

If the holes fit, you can simply replace your focuser with the SteelTrack for Newtonians. Please note that the Steeltrack is designed for tubes with 20cm diameter or larger; for smaller tubes, you need additional spacers (#2957235).

The S52 Dovetail is only at the outer side in a way that the inner M48 thread points to the telescope/lense. Please refer the application Images
according this item.

Yes, with these two adapters you can mount the filter in front of the lens.

You can use the Hyperion with a Barlow lens, but not on a spotting scope - usually, Barlow lenses do not work with spotting scopes because of missing backfocus; they can't be inserted deep enough. It is no problem on a telescope.

To achieve higher magnifications, you need another eyepiece. Unfortunately, there is no Zoom available. You can find an overview about the Celestron eyepieces at
https://www.celestron.de/ce_de/downloads/dl/file/id/1155/product/3444/bersicht_astronomischer_okulare_an_spektiven.pdf
Also, our Classic Orthos and Morpheus eyepieces work.

Yes, this filter can also be used with unmodified cameras as well as for visual use.
We do not have a clip-filter solution, but you can mount any 2" filters in front of a lens. This works for lenses with focal lengths of ca. 80mm and longer; for wide-angle-lenses, astronomical filters work not so good at the edges of the field of view.

To mount a 2" filter in front of a camera lens, you need
Baader DSLR-2" Filter Holder M48/SP54 # 2408166
plus adapters from the SP54-thread to the filter thread of you camera. These are:
Hyperion DT-rings #2958028 - #2458062 and additional Stepper Rings M67 up to M82