Military and Intelligence
Congress should double the retirement benefits of any flag (general or admiral) officer and prohibit taking any paid work after retirement. No paid punditry, no “serving on boards”, no consulting, no nothing, pure retirement. Such a rule should be a condition of becoming a general or admiral (or it’s equivalent in the intelligence services)
Congress and Presidential Administrations
Any congressperson or appointed and approved member of a presidential administration would be able to trade any stock for any reason, but such a trade would be publicly announced and on a 3 month delay.