nflow/sflow export

so, I have seen several other posts asking for netflow export. its available in 11.2 and fully supported in 11.4. that would be great if i was running 11.2 or 11.4...but I am not and an upgrade is not possible at this time. Is there an iRule (lower performance impacting) or some other way way of exporting the netflow? possible using nprobe????

Basically looking for a solution to accomplish this, need to collect this data from multiple devices from different venders...and soon.