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The solvents in Lacquer Thinner are very strong, I don't think anyone can tell you what they would do to O rings or other rubber components of the system. If you think it is clogged, check the flow out the tailpipe, do you have good flow? can you shut it off with hand pressure? Does it stop immediately? You can get a bypass pipe to test the system, but it is unlikely with the miles you have that you have a clogged converter, it is more likely something else, unless someone has used leaded gas in it. If that is the case, no solvent will get it off.
2005 T&C Ltd 3.8 108,000
2000 Caravan 2.4l
1990 Grand Caravan 3.3 149,000 owned 15yrs 4 trannies
1990 Dynasty 3.0 120k 1 tranny 4yrs
1981 Dodge Aries 2.6 only new car I ever bought 225k orig 11yrs
1966 Dodge Coronet 440 Wagon, way old 1 yr. 135$ (Had to borrow it at the bank!)
1964 Simca 1000 (bought for $10 rebored) 50k 4yrs
1965 Ply Valiant V8 85k
1964 Ply Valiant Wagon slant 6 200k 1 qt/200 miles
1969 Corvair convertible 4 carb