IMHO the aggressive bright cap Marshall sound (roaring with crushing glass highs) is more ore less a blind spot in the Helix.
Personally I really like the JVM OD1 orange mode and would like to see something like that in the Helix.
Also there are rumors that the next update is soon to be released and is likely including a stock 2203 JCM 800.
Tip 1: I got pretty close to the JVM OD2 orange model (neutral EQ, Drive 3) with the Badonk with Drive 4.5, B 2.5, M 2.5, T 6.8, P 7.5, Master 4, Depth 5, Sag 7.6.
Tip 2:The shelving eq in front of amps works to a degree. Boost high freq at 1.5kHz as a starting point.