Unsolicited Remote Assistance of non-domain computers

is there a way of enabling unsolicited Remote Assistance on computers that dont belong to a domain?
I tried setting up and enabling unsolicited Remote Assistance from GPO, but I cannot specify 'Helpers' since this has to be a domain group.. turning it for everyone should be fine as well if there is an option to do so..

I found a way

I had the same issue...

I ended up creating a RA user in the domain, give that user helper permissions in the GPO (and had to be in the Remote Desktop Group on the PC being helped)

Then on the non domain PC, run this

C:\windows\system32\runas.exe /uOMAIN\RA /netonly "cmd /c Start /B %windir%\system32\msra.exe /offerra"

This runs the msra cmd as the Domain user from a non-domain PC... it worked. Prompts for the RA user's PW when you run it.

C:\windows\system32\runas.exe /u:domain\RA /netonly "cmd /c Start /B %windir%\system32\msra.exe /offerra"