Yep, chain is cheap enough. Good call.
I learned years ago not to try to bypass using the proper tools when I broke something on my E23 745i as I did not want to buy a $40 crank tool. I bought that tool when I replaced the front main when I performed a valve job on the car.
Figured that was the leak, not the lower cover. So now I have to go in there again.
Besides that, the tool I think also works on my 603. Unless it is the 617 tool that does. I forget. Maybe it is the M116/7.
I know I purchased them all for that reason.