You have given suggested some good measures which will prevent the buyer from doing a charge back. But there are some issues here:
1) If you receive large amount of money as "friends and family" option, PayPal may block your account. That option is not for selling digital items.
2) Also as you are selling digital items, if the buyer makes a chargeback, it will be in his favor. If you do not pay back, you will loose PayPal account.
Thus, it is better to use any other payment option for this. Escrow is best.
This is where most people are wrong. Escrow can't do anything when you are dealing with Paypal as if the buyer is a scammer he has a 180 days open window to charge back the transaction thus making the escrow not valid when dealing with paypal. Paypal and crypto buying/selling are just not a good pair together, there will always be problems when buying/selling bitcoin with Paypal.