Modifying external datagroup within an irule

Here's an example of an REST call we use to instruct the F5 to pull a datagroup from our Adobe CQ CMS;-

curl -k -u cd_user:cd_user -H "Content-Type: application/json" -X PUT -d '{"name":"dg_www.company.com.au_uri_longest","partition":"~CompanyDigital","source-path": "http://10.200.58.96:4502/etc/tools/f5mappings.txt.html?match=longest"}' https://10.200.58.180/mgmt/tm/sys/file/data-group/~CompanyDigital~dg_www.company.com.au_uri_longest

I have another idea - you could use a Sideband connection to write a new datagroup entry to an external file (this would involve having an external system to host the file and accept writes via the sideband connection), and then use an iCall/iStat to trigger the external datagroup update from the external file. I'm pretty sure that would work.