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Here’s a suitable version of your request in English:

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Thank you for your email dated August 28, 2024.

Unfortunately, due to our internal accounting reasons, we are unable to proceed with your proposal. As such, we would like to suggest an alternative. Since the official fees for the 4th and 5th years are typically the same, would it be possible for you to cover the full amount of the 4th-year fee, while Company B covers the full 5th-year fee instead?

In the event of a fee revision by the Patent Office, we will adjust the total amount for the 4th and 5th years to ensure an even split and invoice each party accordingly. However, since the revised law was only enacted on April 1, 2022, the likelihood of a fee revision is generally considered low.

Please note that Company B has already agreed to this proposal.

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This version conveys the message clearly and professionally without being a direct translation.