The only way to solve this is to get the server admin 'kill' you as soon as you join the server, then you can spawn as new, then get a TP back to your gear, just make sure you don't pick the sling up again.
Then it's down to the admin to either pull the mod or try to restrict them from server 'type' file.

I have tried a complete reinstall of OS, tried it with no mods installed and the game being the first non system item installed, i cant even get the game to run long enough to generate a crash report!

without meaning to sound abusive but did you read what I put above, I've tried all and any variation of mods, with and without, with different launchers with and without admin rights, on different drives and also reinstalled and redownloaded all. I'm at the end of my tether and of my limited technical knowledge, hence why I fall back to help from here?

not as yet 8-(

Have had a similar event, just running along doing nothing at all.