Calling Sender File channel through Receiver Channel and Setting filename dynamically to poll

Hi Experts,

I come up with following requirement to achive through PO7.31:

1) PI poll a file from FTP location and calculate filename from payload fields. for Ex: if field1 value = abc and field2 value = def.

then PI has to create filename as abcdef.txt,which we can do through UDF in message mapping and assign to dynamic configuration .

2) Now, we need poll created filename abcdef.txt from other FTP location and move it to receiver system ftp location.

Challenge here are:

1)Which receiver channel type in ICO1 flow can initiate sender file channel of ICO2.

2) how to pass dynamic filename (abcdef.txt) from 1st ICO receiver channel to sender channel of 2nd ICO.

Is there any other way we can make this requirement feasible.

Regards
Deepak