As I understand it, ecdsa.net also works to support UASF on Electrum (just in terms of selecting a server that is supporting BIP148).

The basis for this claim is a post from Electrum twitter at:

https://twitter.com/ElectrumWallet/status/852174246205956096

I'm not sure how easy it will be for your Electrum wallet to get connected to this so it may depend on the situation, traffic, etc. 

Hope this helps!  Add servers to this list if there's more that have been patched to enforce UASF.