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I have been using EC300 with Remora for the last four months, and it has been great. Once I got it up and running, I didn't have any problems. You can now get an EC300 with Remora firmware on eBay.

Do you have a Ethernet connected motion device?

If so, the latency test is relatively useless for determining the actual
LinuxCNC latency.

A simple ping test is much more informative:

sudo chrt 99 ping -i .001 -q -c 60000 [Device_IP]

(will run 1 minute and print out timing statistics)

Where device _IP is the IP address of your Ethernet motion control interface.
 

I have a EL2502 here but have not tried to install it yet. 
I think if you use ethercat sdos and ethercat pdos you will have all the info you need to create a generic profile.
I have written a couple of drivers for unnamed Chinese IO modules this way

From the dmesg log and tainting the kernel, I think you have secure boot is enabled. Try disabling that in your BIOS.

Failing that I did cover very briefly how to enroll the dkms module into the kernel when  you open a spoiler in my how to.
Installing a kernel module (DKMS in this case) under secure boot is denied unless specifically set as being safe. eg it taints the kernel