SPL-Token createMultiSig


when I create a multi signature account with SPL-Token createMultiSig the account is funded with 0.003 SOL. [1]. For example a call in NodeJS would look like this

const mSigAddress = await splToken.createMultisig(connection, feePayer, [ account1.publicKey, account2.publicKey ], 1);

Is there a way to claim back the 0.003 SOL or close the multisig account?

We have to create around 5000 multisig accounts which is expensive when each account is funded with 0.003 SOL and there is no way to close the multisig account or transfer out the remaining SOL.

How you guys build software when client A may sign the transaction with his own key and software publisher B?

[1] Solscan