I think the OP needs to think about his plan. If he's planning to stay 5s in the foreseeable future he should either buy a 5s hub, or respace the 6s to reduce dish. However, if he plans to move to 6s next time he buys a freewheel (an easy upgrade with friction shifting), then he should leave the hub spaced for 6s.
Spacing and dishing a wheel to change form 5s to 6s (or whatever) takes roughly 1/2 an hour for an experienced mechanic, but the OP doesn't seem to fit that bill, so changing then changing back would likely be a wasteful expense.
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