The subjuntive is quite common in the US (and required for proper grammar in formal contexts).
It's taught in our public schools and most of us are pretty adept at using the subjunctive for conditionals/suggestions/hypotheticals, even in casual conversations.
The rephrased example in the indicative mood (i.e., "I suggest that he implements ...") sounds horrid to my American ear. To me that's not at all grammatically correct. Most Americans would use "implement" in that sentence instead.
The example with "suggest" would occur more frequently. The bare infintive "be" is used commonly too though, albeit slightly less common.
The verb most commonly used in AmE with the subjunctive mood is "were," as in, "If I were to win the lottery, I'd buy a new car." It's most common in the first person singular, but it does occur in the 3rd person as in, "If she were to get her teeth fixed, she'd be much prettier."
In your case:
"If he were to (-or- should he) implement a new budget, we'd increase our gross profit margin."
"Were he to implement the new budget, he'd drastically improve his unit's performance."
"He might implement the new budget were I to (-or- if I were to) provide him additional support."
etc.
We tend to contract auxiliaries and modals in the US whenever possible in all but the most formal speech/writing. Obviously this is dialogue, so I opted for less formal.
Anecdotally, I find that Americans are more self-conscious about being perceived as stupid or uneducated. We are concerned about people thinking we can't speak proper English.
Best Answer
As if it weren't bad enough is a phrase that will be followed by two events, one 'bad' (as in bad enough) and one even more so.
As means as though or like. When you use as if, you can use the subjunctive, though it isn't strictly necessary, especially if there isn't anything unreal about the situation:
The first year of marriage is a time to get to know your spouse, set up a home, etc. It's busy enough that writing a book is difficult. But the first year of parenthood is even busier, and an even worse time to write a book. Hence the as if it weren't bad enough. In doing so, s/he robbed him/herself and spouse of quality time together.