BASM? Yes we can!
BASM may not be in the Delphi 64 preview, but a proof of concept of “BASM-for-DWS” is now available for DWScript in the SVN!
It builds upon recently introduced “language extensions”, to allow “asm” blocks, which will be pre-parsed (to allow BASM-like references to local variables), and then fed to NASM for actual assembling (which you’ll need to download).