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So if this barrel and action were produced in Belgium then that would make sense as that is what the proof marks suggest. I had read that Belgium proofed barrels and such but I did not realize they sold Belgian made guns to other gunsmiths in other countries.

Is there anyone who can verify the gunsmith as Belgian or Dutch? 
I originally found the same auction for the pistols made by C.L. Witte, wasn't that auction listed as a Dutch gunsmith??

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I think it qualifies as a long rifle.

In MHO this rifle is in fairly good external condition. Providing that the breach block can be restored at a reasonable cost, would you head down the road of a full metal restoration, as in case hardening the entire receiver? If the block can be freed of its brass it will have to be annealed and re-case hardened to be safe with black powder, and even that makes me cringe a bit when I think of my face behind that block.

Are there any numbers on the top of the buttplate?
Here's some more cartridge info: "the original case was 45 mm long and had 3 grams of BP and a bullet of 22,8 grams this combination was called cartridge no 9, later they rechambered to no 8 cartridge same as for the beaumont rifle case 51 mm 4,25 grams op BP and bullet 25 grams"
and maybe a source of info: "Further you can try to make contact with the conservator of the Dutch Army museum M. Willemsen, he has written several times on the Dutch Remington carbines in English."
The big question for me is why would a gunmaker "to the King" be messing with a common military rifle? Maybe this M. Willemsen has a clue.

Spoke with my importer buddy just a bit ago and he gave me some additional information on the rifle. He purchased this rifle in Sweden along with several other guns from the Evert Taube estate. The gun shop he bought them from had been keeping them in a vault until the estate could be settled. I guess this is why the tape was on the butt plate. This was the only gun my friend held on to for the last 20 years thinking he would fix it one day.