Ok, I just read an article on this topic. If I understand correctly, I can buy $10k for myself and purchase another $10k as a gift for my spouse, but can't "deliver" it any sooner than 2023. If she has already bought $10k for herself, she in turn, can also gift me $10k as well, but once again can't deliver it until 2023. If we both do this, neither of us can buy I bonds next year, but we will have locked in the high existing rate of return and the gifts will start earning interest immediately even so they are "sitting" in the gift box awaiting delivery. Is this correct?
I believe your understanding is correct. I've never done this, but I read on Bogleheads that a lot of people have done it. It sounds like there's currently a glitch with buying gifts right now. The site is supposed to undergo maintenance Sunday morning and maybe it'll be fixed.
One thing I have read recently, is speculation that the fixed rate portion of the I bond interest rate formula may change from zero to a few percent in Nov or Dec. If this is true, the additional benefit would be locking in the fixed rate portion of the interest formula for any bonds purchased. The existing fixed rate is locked in when you purchase an I bond. This means that even as the CPI rates change in the future, your future overall rate will potentially be higher because you will be locking a higher fixed rate in the formula. Assuming I am getting all of this correct, purchasing the $20k in future bonds as gifts in November or December for a delivery in 2023, instead of buying them this month, could potentially combine the benefits of both strategies.
No one knows what the new fixed rate will be. Some speculate it will stay at 0% because there's already so much demand for I bonds that they don't need to drive any more. Some think it might go up since treasury interest rates have been rising (particularly 10 year TIPS yield) and generally the fixed rate rises with them. I highly doubt it'll be raised to a few percent. I'd be incredibly surprised if it's over 1% and suspect it'll be in the 0-0.5% range. In the end, no one knows.
The problem with waiting until November is that you lose the current high 9.62% adjustable rate. Buying in November means your adjustable rate will be 6.48%. The only thing you gain then with gifting over waiting until 2023 to buy directly is starting the clock/earning interest a couple months early. So you can't combine the benefits of a (potential) higher fixed rate and the current higher adjustable rate.
If you're planning to hold short-term, I don't think the benefits of a small fixed rate will overcome losing the high 9.62% adjustable rate. If you're planning to hold 10-20 years, it might. But you're still taking a risk because the new fixed rate might be 0% and you lose the 9.62% for nothing.
I don't have a spouse and don't have free cash right now to try and do another $10k as a gift, so I'll be waiting until 2023 and hoping the fixed rate rises! But I did create a trust and bought an additional $10k for that in April. That's another option as well to get an additional $10k per year in I bonds.