Removing Thick Wood Floor Adhesive from Plywood Subfloor

Does anyone have any suggestions on how to remove thick wood floor adhesive (already pulled up the parkay floor) from a plywood subfloor. I have a few ideas but none seem to be the right answer.

Option 1. Use a floor scraper (Floor Pro Scraper) from Home Depot but I am concerned it will dig into the plywood subfloor.
PRO Floor Stripper Rental - The Home Depot

Option 2. Use a coating removal disc with a floor maintainer (orbital). Same concern I think it will eat up a plywood subfloor.

Coating Removal Tool Rental - The Home Depot

Option 3. Use a auto leveler and go over the glue. Not sure that this will stick will and it will cost at least $1,500 as I am doing about 1,350 square feet and the glue is at 1/8" think in most spots.

Option 4: Rent an orbital sand and sand it down but am not sure the glue will gum up or how long it will take to get through the glue or how many sheets of $10 / sheet sand paper it will use.

Suggestions and thoughts appreciated. I don't want to have to pay to rent in option 1 and 2 and it not work.

 

What flooring are you putting back into the space? Any attempt to sand or grind will just gum up the mechanism and be useless. Would be easier to replace the plywood, which may be the logical solution in the end.