You need to get yourself some brewing software and take a crash course in using it. I use
Brewsta. Offhand I couldn't get a quick feel for your suggested recipe, except it didn't look liek enough fermentables. When I plugged it into Brewsta, took all of 2 minutes, I get an OG of 1034 (very low) and about 62 IBUs (very high for such a low gravity; assuming you add them all for 60 minutes). Yeah, it would look like beer, but it might suck your face through the other side of your head. The color would be very pale. The style, extremely bitter pale mild?? I dunno. It is way out of any style I can think of. You could get the bitterness down a lot by adding the Challenger in stages, e.g., half for 60 min, 1/4 for 20 minutes, 1/4 for 5 minutes, then the goldings at flame out.
Going back to my original suggestion, which would have used up all your malt, which is what your first post suggested was your aim ("I need to clear out my malts"), plus another 0.5 kg of dry malt, you would get an OG of 1058, which is much more like it for that much bittering. I'd still break the Challenger into two additions.
If getting more malt is not an option, then leave out the extra 0.5 kg of malt, and use all your malt, all of it (you'll get a OG of 1048 for 19L), and use the hops as I just suggested 1/2, 1/4, 1/4 (38 IBUs). That will be a much more balanced and quite malty pale ale.
And remember my first tip: get Brewsta!