I suspect NewWave may be thinking of Honor Oak Park rather than Crofton. That's the route I used to take when walking to East Forest Hill. If you're starting from near SE23 I don't in my old A-Z see any non-A205 route crossing the railway line other than HOP. I'd then fairly soon turn east from Brockley Rise and try cutting across Blythe Hill Fields, which seems directly en route.
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