The issue of holding organization funds by an individual, lets say the treasurer of the organization should be heavily discouraged as most times it does not end well and leads to the funds being utilized or stolen by the person in charge. organizations should plan their startup properly and that includes being properly registered with the government which enables them to open a company account with approved banks.
You started a good topic; it really needs discussion. Even these things are taught by many mentors, if you have any in the field of organizations. I mean, those who are planning to be in charge of the funds of some organisation, or if you want to vote for some person to make him one. Then you must have some mentors or seniors who are already aware of such things.
They should have told you about such things; otherwise, the studies of accountants are also comprised of this knowledge. But as we are all not accounting students or have any experience, this topic is really a good help for those who don't have any idea before.
A good solution to this is to have an entirely different account to receive funds that is not yours and refuse to have ATM card or much access to that account. In fact, the account should be as good as forgotten by you and the only connection to it is withdrawing funds for the organization purpose, Receiving credit and debit alerts to be able to monitor the activities of the account. You also need to have a place that you detail the transactions on that account, like your private record so that you can have the account record ready at any time it is requested by the organization.
Your tips are awesome, I think you should add another tip of another security level in making Transaction from the organization's funds. Which is similar to multi signature wallets. In this, if you are the custodial of the organization's money, then in order to use them, you have to get permission, but of course you might not remember or don't want to take permission, so those people should have to set a setting in the bank, that once we 2 or 3 people approve the transaction, then you are allowed to transfer the funds.
I think this system is known as Dual control system.