Not really. Margin addresses an individual position's risk and is the same for all customers. The exposure fee addresses portfolio risk and is unique to each customer.
You can break it down to the individual parts and affect the overall portfolio risk as a sum of it's parts.
Obviously individual position is not portfolio risk. But if you set margin requirement high enough for individual positions, on it's own, then the sum of it's parts (the portfolio) can have similar safety net.
If the target is a 30% drawdown protection, this means to me you need cash to cover 30% drop in position value. For a $10K stock, you need $3K at least to hold it. Margin will be 30% position value minimum for stocks. For ES futures with 50 multiplier at 2350, it is a $117,500 nominal position per contract. So instead of CME suggested around $5K margin, lets just say I want $35,250 maintenance margin instead to cover a potential 30% droop. We can continue with examples.
Obviously for ES they are not that extreme. Instead they let you trade ES at slightly higher than CME margin requirements, and then charge you an exposure fee if you're "over exposed". But they could scrap the maintenance fee and go out and ask for $35K maintenance margin per contract if they want. That should protect against a 30% one day move at today's prices for everyone's portfolio.
So you very much CAN individually tailor individual position margin, to cover for 30% adverse move. And the overall portfolio? It will be covered for 30% adverse move as a whole with enhanced margin requirement. It is marked daily. Which means after it drops 30%, you would have been auto liquidated. And in the off chance you slip negative, there is margin call.