Is there any way to get around the miles conversion fee to your KrisFlyer account?

In addition to all the cards that eople have mentioned here, OCBC VOYAGE has no conversion fee, nor does the UOB Visa Infinite, UOB Reserve, UOB Visa Infinite Metal, nor does the AMEX Platinum Credit Card, Platinum Reserve, Platinum Charge, Centurion

Short answer, no.

UNLESS, you are willing to sacrifice optimising MPD and focus on 3 cards:

1) OCBC 90N -- No conversion fee

2) UOB Krisflyer -- miles are directly deposited into your Krisflyer account

3) AMEX Krisflyer -- miles are directly deposited into your Krisflyer account

Hope this helps, although please don't.