The Kusama side is more promising 
If/when the bridge allows it, Kusama could request DOT to the Polkadot treasury and use it to feed the pool and give rewards. I don’t know what pieces are missing, but in theory one of the governance origins in Kusama could send an XCM over the bridge to submit a proposal to use treasury.spend which allows beneficiaries to be xcm locations, also in theory if the beneficiary is on the Kusama side the pallet should use the bridge automatically. It would be interesting to know what pieces are missing to make that happen.
With the ksm.community I want to propose Kusama treasury to feed KSM to a smart contract in Kreivo to give rewards to the contributors of the pool. 