I don’t understand how you can severe any part of this bill or provide an exemptions without a severability clause.
In absence of such clause this thing should be tossed overboard as defective in solido.
The “severability clause” only comes into play when a portion of the law is ruled Unconstitutional by an element of the judicary. When included it’s use is to preserve the rest of the law, the so-called “good” parts, after a portion is deemed bad; without it the whole law goes down. It has nothing to do with subsequent legislative action to repeal or otherwise alter parts of a law with or without such a clause.