You can do this with sites that has a wlc, but with sites that have autonomous APs, you will need to find a 3rd party web hosting software to accomplish this.
You might want to see if you can convert those autonomous APs to h-reap/FlexConnect and you should be able to use WLC's from other sites. I don't know if this is possible, but it depends on you APs and really your wan link.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
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