Paramount

Unfortunately we do not know the Meade telescopes finderscope holder. But if its a standard one similar to Celestron, one of the SkySurfers bases will fit. You can see here in the manual the scope of delivery https://www.baader-planetarium.com/en/downloads/dl/file/id/1487/product/1748/manual_for_the_baader_skysurfer_iii.pdf

You can attach the female T-2 thread of the C-Mount Adapter to the female 2" SC thread of the 2" Universal flange with our 2" / T-2 (male) Adapter #1508035
https://www.baader-planetarium.com/en/accessories/adapters-imaging-accessories/2-inch-sc-thread/baader-adapter-2%22-(male)--t-2-(male).html

We do have Baader 2" ClickLock M48i clamp (2" filter/photo thread) #2956248 with a female M48-thread.
If you are in the USA, please contact alpineastro.com, our distributor for the USA. You can also use our dealer locator at https://www.baader-planetarium.com/en/storelocator

Yes, you will need our Diamond Steeltrack M68 Adapter (#2957206):
https://www.baader-planetarium.com/en/diamond-steeltrack-m68-adapter.html

Please note that the K-Line-filter is only intended for photography, not for visual use, as the K-line is well in the UV.

You can't combine K-Line and Solar continuum, as one filter only lets green light pass, and the other one only deepest blue.

You can replace the Solar Continuum with the K-Line-filter, but the image will probably still be too dark - and it will almost certainly be much too bright if you remove the ND3-filter, too. This depends on the sensitivity of your camera and on the f/ratio of the telescope, so we can't say which filter will be the right one.

The photographic version of the Herschel wedge contains three 2" ND-filters. If you do not have the photo-version of the Herschel, you can also buy them seperately at
https://www.baader-planetarium.com/en/filters/polarizer-neutral-density/baader-neutral-density-filter-(nd-1.8-t1.5).html
As the K-Line-filter is only 1.25", you can also buy only the 1,25"-filters for photography.

You may need more than one filter, if you use e.g. a Barlow lens for higher magnifications - then you need a stronger filter like ND1.8 for lower magnifications and e.g. ND0.9 or even N.0.6 for those times when the seeing permits highest magnifications.