Here are some hacks around this:
Increase your post-money valuation on your SAFEs by 20% from where you would normally price your company to account for the fact that the SAFE will not dilute with the other SAFEs.
If you can delete the words "Includes All Converting Securities" in the "Company Capitalization" section of the SAFE then the SAFE will dilute by the future SAFEs. But you may need to notify your investors that it's not a market SAFE and they may balk at this.
What is nicer about this Post-Money SAFE vs the prior SAFES is that they do dilute by the option pool increase in the round. So if an investor asks to add 10% to the option pool, in the past the SAFEs converting would not dilute by this 10%. But now they will dilute by that amount. So that does mitigate some of the impact.