[Elecraft] 6 Khz Filter Use in Data A Mode

[AL7CR]

I wish to be able to recieve and transmit using the WSJT-X  JT65 + JT-9
mode.  I know from archived posts on this subject that my recieve
bandwidth using a 6 Khz filter in Data-A will be approximately 300 -
4200.  The question is can I also transmit in this range in Data A?  I
do not want to buy the filter unless this is possible.  The filter setup
utility appears to allow this however the Elecraft and Cady manuals
state in many places that you must transmit SSB through either the 2.7
or 2.8  filter.  Perhaps the ESSB feature allows this operation but it
is not clear if this functions in Data A or if it is required in that
mode.