Add command to write own code into file containing delayed floats
For example:
\efloatwrite{figure}{...blah...}
-or-
\addtodelayedfloat{figure}{...blah...}
-or-
\delayedfloatstuff{figure}{...blah...}
which will do:
\efloat@opencond{fff}\efloat@iwrite{fff}{...}