Can I change my e-Visa to a non-O multiple entry one-year visa?

Asking this here will give you gray hair. It's better to go to the immigration and ask

𝐂𝐚𝐧 𝐈 𝐜𝐡𝐚𝐧𝐠𝐞 𝐭𝐡𝐢𝐬 𝐕𝐢𝐬𝐚 𝐭𝐨 𝐚 𝐧𝐨𝐧-𝐎 𝐦𝐮𝐥𝐭𝐢𝐩𝐥𝐞 𝐞𝐧𝐭𝐫𝐲 𝟏 𝐲𝐞𝐚𝐫 𝐕𝐢𝐬𝐚?

NO you cannot 😕 🙁

It works like this;

You got a 90 day entry stamp when you came into the country with that visa

You can apply for a yearly extension at MOST offices when you have 30 days or less left on that 90 day stamp.

You need to meet the financial and documentation requirements at your immigration office and apply for the year extension for 1900baht.

Once the extension is granted you could apply for a multiple re-entry permit 3800baht (the extension and the re-entry permit are two completely different things) <- after you do that then you can exit/re-enter the country the whole year and get stamped in until the yearly extension expires every time

The real question is,

Can you time it so you're IN thailand when your 90 day stamp runs down enough so you can apply for the year extension?

You'd probably have to get a single re-entry permit (which would keep this 90 day stamp valid when you exit) and then 6 weeks later when you come back you'd get stamped in for the same expiration date (the date you got when you entered the country on the 90 day Non-O visa)

then you could apply for the extension at your immigration office