I am going to assume "reputable" as in larger mineral company, with a clear public record of transactions. In most cases, the language in the PSA for in-person closing is a last resort. While most companies should have no issues meeting you to close a transaction, generally this is all done by overnighting of documents and wires. It takes a bit of trust but as long as you have a PSA and not an LOI from a reputable company; you may not have to meet in person to finalize the sale.
Generally, if I were to close a mineral deal. I would overnight you a deed to sign and notarized and send back to me. Once I have the tracking number, I will overnight you the check to purchase the minerals. This way you don't have the deed, and I don't have the check. I've never had anyone overnight an empty envelope and hopefully, I never do. The same can also be done with a Wire. However, most companies will wait to have the deed in hand before initiating the wire given most wires from large institutions (not ACH) happen instantly.
Hope this help. Also, sorry for the Reputable part. Its just I have seen many unethical players hold deeds over people because they don't have the money and are trying to flip the minerals. Always good to be cautious.