Seriously, your sister visited once and now you're rewiring your whole office over a birch tree?

Did you try taking the nozzle apart to soak it in vinegar before giving up on it? Hard water and fertilizer salts build up fast in those tiny brass holes and a lot of people toss the thing when it just needs a good soak. Curious if yours was truly dead or just clogged, since that would change whether the fancy ones are actually worth it.

Ha, wheat paste is great until the humidity comes back and that spine goes soft on you. PVA has held up for a reason, and a hair dryer fix at a fair is one thing but a few years of use is another. I would keep your old glue around till the wheat paste proves itself over time.