Is there working UI for legacy gnosis/MultiSigWallet?
The code for the Gnosis legacy multisig is at GitHub - gnosis/MultiSigWallet: Allows multiple parties to agree on transactions before execution.. Worst case you can try to run it yourself or get someone tech savy to do it for you.
The Github repo also mentions an ipfs deployment at Multisignature Wallet. At first glance it seems to be still working, but no guarentees, obviously.
Hope this helps!