Leaving the engine without an appropriate harmonic balancer might cause the crank to CRACK. Which would lead to more catastrophic failure.
In your case, I wouldn't go for a solid harmonic balancer which actually doesn't balance at all.
There is a problem and it's better to solve it, than to mask.
Go for ATI Damper. They are the best stuff on the market. If it'd break, than you really need to look inside and rebalance the crank. Maybe it's some resonance, like the one occurs on Nissan L28 engines at about 7000 RPM which causes the harmonic balancer bolt to torque down.

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1988 Mercedes-Benz 300TE
1984 Toyota Celica GT-R AA63 (JDM)
1989 Audi V8 3.6 quattro