I'm not aware of any medications beyond those you have listed that you are either on or have tried.
I have had a higher dose of Prednisone than you - 20 mg daily - to address joint pain. The most bothersome joint pain I had felt like someone had poured battery acid into all the small joints of my feet and toes. The 20 mg was enough to control it.
Several of our members have doses of Prednisone much higher than 10 mg to help with the joint pain - I think some have had doses as high as 60 mg daily. Certainly not the optimum solution, but if you can use a higher dose temporarily to decrease joint inflammation it might be helpful.
I have recently begin to have joint pain again - aching and itching in the large joints and the burning pain in the small joints of my hands & fingers. I see the Dr in a couple of weeks - I'll try to remember to let you know if they offer me any medication-based remedies.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2000DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde