It took some Rube Goldberg thinking for me to plan it. You can spin the crank twice to be back in phase with the cam although I suppose spinning the crank once does the same thing since there's no phasing of the crank. The Dieseler in me says to spin in 720-degree increments. If you marked the cam sprocket and a link you'll lose the relationship unless you know how many crank turns gets a link back to the same spot. You can't count links without turning the crank so math's not an option. It might be if you have access to a another chain. You can zip-tie the cam sprocket to the chain loose enough to let the chain flow but tight enough not to lose timing.

In the end it seemed like a lot of work so I used a vacuum to pick up what I scraped off with the 2-3-4-5 pistons lowered They're not spotless, but I must have knocked a point off the compression.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD