TinplateBob,
If you want to alter your rolling stock to use your 031 track with it that is fine, many do but it does not mean that the rolling stock actually was designed for 031 track. Infact your 263E will run on 027 track also, but it was not really designed for it. Your suggestion to use the 2800 rolling stock or the 072 track is the better option.
PCRR/Dave