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BTW, removing the walnut plug is a tricky job, but can be done quite clean. Did it a few times on Am Standards and Am Deluxes, a bit more PITA on Deluxes with thicker gloss finish, but works the same.

First, you need a grip hex wrench to remove the nut and it also works to remove the plug. You also need a small soft brush, a piece of brass or copper tubing that goes inside the hole, a very sharp knife and, yes, a soldering iron.

Turn the nut counterclockwise as far as it will go.
Moisten inside the plug with the brush soaked in water.
Plug the tubing inside and heat it with the soldering iron as long as it steams.
Repeat a few times and turn the nut a bit further each time, very slow. Moisten and heat the plug again and turn the nut, at some point you'll see the plug move.
Pay attention to the lacquer: it becomes softer and you can use the knife to very carefully cut the lacquer along the break line. (In some cases it wasn't even needed, but on Am Deluxe I'd be very careful).
The nut will probably go off the thread before the plug goes out completely, but you'll have a part of it sticking out enough to pull it out. That's all.

Я тут погуглил.
По спекам  у Страт Плюс именно бифлекс.
Похоже, что и на  АмДелюксах тоже, я всё удивлялся, чего там дырочка такая маленькая.