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The politically feasible move is probably to break up the homogenous pensioner voting block. I'd say some version of means testing/adjusting benefits could achieve that.
If they start with a really high asset bar and have the benefits taper off pretty slowly, so that it only effects say the top 10% of current pensioners, they might be able to stoke fears about the current system's solvency and play into "eat the rich" sentiments.