You can if you use the Repetier-Server. Sounds like a good idea to add it to the next host release as well.
In any case you have to put it some commands after bed heating as the server/host send more commands into the queue and it does not know which were already executed. So put it come 10 commands after heatup command. Adding dummy commands that have no effect liek G92 E0 is ok, you just need to fill the 127 byte input buffer.