Sure, keg hopping is done a lot. You need a roomy enough bag so the hops can swell and beer can freely permeate it to extract the hop oils. Put some weights in it (a stainless fitting or glass marbles) so it sinks. You can leave it on the bottom for the duration of the keg, or suspend with a piece of unflavored dental floss coming out along the lid opening, so you can retrieve it at some point, if that's what you want to do. Some lids have a tab welded on the bottom for that purpose.
Oxygen is the nemesis of beer, especially hoppy ones as they show signs of oxidation much faster.
You need to do everything you can to prevent air from going into that keg while adding the keg (dry) hops.
- Stream CO2 into the keg (through gas post) while removing the lid (open the PRV first) and while working with the open keg, so air can't get in.
- Have the "pre-purged" mesh bag with hops ready to be dropped in. Roll it up, so there are no huge air pockets.
- Work fast and diligently. Once you drop the bag in, the beer will start to foam up, so be ready to remount the lid quickly.
- Purge the headspace at least 5x at 20-30 psi, to reduce/remove any air that may have gotten in.
If your keg is free of sludge you can agitate (swirling, shaking, rocking, etc.) to help with faster and more thorough hop extraction. Some fine dust may come out and give you a bit of a hop bite for a few days until it settles; it comes out with the first few pours. If you want to agitate and there's settlement in the keg, it's best to jump the clear beer into another keg before adding the keg hops.
How much Honey malt did you use?
Are you sure it's just the honey malt?
Recipe, perhaps? OG and FG?