I recommend a thorough soak in kerosene. Loosening the outer “cone” slightly with a pin spanner will allow for flushing some of the crud out the back side. Once the bulk of the hardened grease/crud has been flushed out and the pawls are functioning properly, re-adjust the outer cone to the “Goldilocks” setting (not too tight, not too loose). Since the bearings have little if any weight bearing duty (unlike wheel bearings or headset bearings) serious “greasing” isn’t required. I usually drizzle some Phil’s Tenacious Oil into the bearing races from both the inside and outside.
RE: full disassembly, it has potential for becoming a “mini disaster” but I’ve done it several times with complete success (without even watching a YouTube video) . Count and separate the bearings from the outside and inside races. Be sure to not lose the little springs that push the pawls out (prolly not likely on disassembly due to the thick grease). I’m sure that the suggested references would allow for successful rebuild!