> TreasuryDirect is so horrible to use

Sure its horrible to use. But it does the job, and is directly part of US Treasury auctions, so the prices are provably fair.

Brokerages will skim off a bit off the top when they sell you a treasury. In contrast, TreasuryDirect is direct-from-auction, with the fairest prices possible.

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Besides, its not like a notarized snail-mail form is that hard to accomplish. Back in the day, that was the only way to get any official business done.

Your local bank probably has a notary on hand to sign the appropriate form. If not, look up your Yellow Pages for the nearest notary.