Hillbilly techniques, I like that one Mike. Personally I would get the flywheel lock for two reasons, as stated before, so nothing goes flying out and hitting someone or breaking something else that would have to be fixed AND so that the engine doesn't turn while the chain is off or loose. My 2 cents

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)