It’s funny to me that nowadays DHS is such a basic, obvious, universal upgrade when moving from L1 to L2 tech, but in-universe and out it seems to have been often neglected by the folks first using the Helm Core. The 3050 Panther, Atlas, Enforcer, and I’m sure others would be so much better with the simple swap to DHS that any of us would make in our sleep.
As for a hypothetical Enforcer II, it’s probably better to take speculation to the design boards.
I posted something a day or 2 ago.
As for DHS, its so much worse that just those 3.
Remember, several mechs that now have DHS were only retconned to have them.
IIRC the following had SHS in the original TRO3050 & were later retconned to be DHS.
Clint-2-3U
BlackJack-2
PhoenixHawk-3M
Scorpion ERPPC Refit.
That said, as you mentioned, you have a bunch of designs that never got the DHS retcon. Or got them via later variants.
Off the top of my head......
Spider, Jenner, Panther
Enforcer, Centurion, Wolverine-7D
Catapult, Jaggermech, Grasshopper, Guillotine
Hatamoto, Victor, Stalker-S, Cyclops, Atlas