One little problem with the Maxon Coreless motor they detail in their literature. Virtually all the command stuff uses PWM for the motor drive. I imagine that back-EMF would be minimal, so forget about ERR Cruise.
Your right choke and 20K + PWM. The ERR board will do, probably no cruise. Do you know the frequency of the PWM on the DCS boards ? If high enough you might be able to cruise with a Tach. I keep looking at H bridges on eBay and they have some that operate at 80K supposedly designed to play nice with coreless motors. The HO crowd have DCC boards that do so. I know one thing the DCDR and other non legacy Lionel boards don't get along at all with coreless. j