This proposal will convert aUSD to aSEED in the on-chain assetRegistry (token name as aUSD SEED and token symbol as aSEED), read more here

Acala preimage:
0x7a070001246155534420534545441461534545440c00e87648170000000000000000000000

Refer: https://acala.discourse.group/t/aseed-i-ausd-to-aseed-conversion/2175