Just thought i'd add something from my lastest experience.
I got a call from my friend who feed our boys one morning, nearly in tears she tells me that she thinks Joey has broken his leg/knee or something cause it was all swollen & was holding it sideways & would not walk on it. Now the night before it had been my turn to feed & he was fine, not a limp nothing!
Anyway we got the vet out 2 hrs later (took us 45mins to get him 150m up from the paddock) & he had an abscess on the inside of his hoof. A seddative & 3 pain blockers & alot of digging later, she had reached it, only 3ml came out, lol.
Ok so it's been six weeks and rode him for the first time today, my boy is back. The only medical treatment I gave him was
1. Gave one antibiotic shot per day for 5 days.
2. Kept foot wrapped for 4 days.
3. Once wrap was off cleaned hoof out with WATER ONLY morning & night. (packing it with anything can cause more harm than good p.s. more infection)
4. NO riding until completly heald, thus why my arse & legs are so sore tonight lol.
5. Add 60ml of BIOTIN in his feed once a day. And keep it going as it is great for their feet.
Got this advice from my dad, he used the same treatment on his pinto colt when he was a baby & only had half a hoof. 16yrs later & has never had a problem.
Sorry for the long story but if it worked for us it may work for you, it will take time, longer than my 6 weeks but if it's your horses wellbeing that your caring for then it's worth it.
Like I said this was just my expeience, hope you find something to help.
P.S. The shoe is a good idea but getting a farrier with some experence with such problems would be better, as it would have to be checked every 4-5 weeks.