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55mm? I’d say not, unless you mind your pushing leg being a bloodied peg by Bristol!
I did it on a homebrewed longer-than-average wheelbase slalom board. 76mm wheels with 78a rear, 80a fronts but even then, sections of the path at speed would rattle the fillings. It was also a narrow deck with ridiculous concave, so it was easy to pump when I got tired of pushing.
All said: I think you should try to skate it! If I remember it right, the Bristol end seems to be slightly downhill and you can really clip along at the end... apart from slamming, I only remember the exhilaration of the last mile or so, not the slog before : )
I did that path many years ago on one of the Bath > Bristol longboard pushes that Lush runs - stacked it where it crosses the railway line BUT STILL CAME IN FIRST*.
*it's not a race BUT STILL.