Currently we provide an chrome extension which allows easy interaction with the Safe app. This chrome extension is injecting a provider (similar to MetaMask).
I think a lot of the wallet folks (Wallet Ring) are working to some extend on providers (e.g. @pedrouid for walletconnect) and some of the discussions that are assigned to the wallet ring might be interesting for the provider ring as well (e.g. EIP 747: wallet_watchAsset and Add `wallet_` methods to improve dapp to wallet interaction)
Also there is still not clear definition how we could have something like a “provider” for mobile (at least a wallet provider maybe).