In the ESP section, trigger position is mentioned explicitly as a permitted modification:
8.2.2.2.11 Aftermarket triggers and trigger work that result in the trigger being forward or rearward from the stock trigger position.
However, it isn't mentioned in the SSP section, so that seems to imply it's not allowed.
(Permitted) 8.2.1.3.3 Magazine releases, slide stops, safety levers, de-cocking levers, hammers, and triggers, that are stock on one SSP legal firearm may be used on another SSP legal firearm from the same manufacturer provided they are drop in replacements. Parts in this list must come factory installed on standard production firearms. Special parts that are available installed only from a factory custom shop are not eligible in SSP.
(Excluded) 8.2.1.4.1 Externally visible modifications other than those listed in the Permitted Modifications section.
My interpretation, then, is that a stock 97B would be fine for SSP, ESP and CDP, but a 97B with an alteration that deviates from the stock position of the trigger (e.g.: CGW Reach Reduction Kit) is illegal for SSP and therefore doesn't qualify for the rules quoted above.
Am I reading this wrong? I thought a modification that's not explicitly allowed is prohibited by default.