Just an opinion, but one thing that looks really nice on a hi-rail steam locomotive is a set of scale wheels of proper diameter on the pilot truck. You'd need flat-top rail and to take turnouts are low speed, though.

Matt Jackson
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I do like the look of that, very nice... definitely a worthwhile upgrade. 

Slaters (very much “the Old Firm” for this sort of thing in the U.K.) do a 19mm Steel disc wheel in O Gauge, that looks like the first thing to try. 

I’ve now sourced a spare pilot so I’ll pay a quick visit to Slaters website and convert the spare pilot when it appears, and see how it develops. 

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