Don, what type of stove do you have? I think it is a US Stove furnace??
If so it has the grates at the bottom of the firebox with firebrick on the sides sloped at 45* or so? Is this right?
My firebox is like this, and I use a 4' long piece of 1/2" diameter steel rod with a 4" 90* bend on the end. I use the bent 'L' like a finger or rake to slide under the coal bed and down each side of the firebrick to encourage the ash to get to the bottom of the firebox and through the grate.
Do you have any garden tools like a small hoe, or a 'grub rake' that might work for a while?? If you go to a Home depot or hardware store, you can buy a length of 3/8" or 1/2" rod and bend that finger on the end. The handle end of my poker has a loop bent on it, but without heat this would be pretty difficult.
If you can't figure something out from the garden utensils, how about a long crowbar? With gloves, you could use this to move the ash around on the grate to encourage it to fall into the ash pan.
Hope you find something to do the job.