would this save time

[washita]

I have the 425 and a rotiller, I am replacing the sidewalk at the rental property. Currently the process is dig up cement then rototill then scrape out loose dirt with scraper blade. I wonder if I could combine the tilling and scraping operation by mounting the cutter blade from the scraper onto the back bottom edge of the tiller. This might be too much for the 425 to do a one time?

 

[Carpenter]

When I replaced my sidewalk I removed the old concrete, soaked down the ground, let it sit overnight and then dug out the dirt with the bucket. I do have nice soil with few rocks. I dug out 4" of soil and put in gravel and compacted for my base.

I don't have a tiller for my 425 but I'm guessing tilling and trying to pull very much dirt at the same time would be a bit too much.