The next thing you can consider is that upon reaching 55, you can do RA top ups to the ERS level, but such topups don't get tax benefits and furthermore, cannot be withdrawn in lump sum so think carefully.
The
top-ups (and interest on the top-ups) cannot be withdrawn in lump sums, but the contributions "underneath" those top-ups often can. And the more your top-ups, the more of those compulsory contributions you might be able to withdraw in lump sums, if/when desired. Let me illustrate....
Let's suppose A4973 has topped up his/her Special Account by $35,000 (5 annual contributions of $7,000 each) already, and the rest of the contributions were compulsory contributions associated with work in Singapore. At age 55, A4973 decides to top up his/her Retirement Account by another $35,000. Then, at age 65 (or 70, or anywhere in between), A4973 decides to participate in CPF LIFE at the Full Retirement Sum (FRS) level. That's no problem. $70,000, plus interest, won't come close to the FRS, and the rest (above FRS and accrued interest) can be withdrawn in lump sum(s) if desired.
Yes, it's true that SA/RA top ups (and interest on those top ups) must be paid out in the form of CPF LIFE lifetime annuity payments. (Which is still real money!) But to some extent at least the top-ups can "squeeze out" compulsory contributions and make them available for lump sum withdrawals, if desired. It just depends on the situation.
By the way, another option is to top up a qualified family member's account -- "qualified" in this case meaning that the top up would qualify for tax relief. See
here for details.
And another option, if you're below the CPF Annual Limit and if your Medisave Account has not reached the Basic Healthcare Sum (BHS), is to top-up your Medisave Account.