Again, I stress my limited Japanese, but this page here:

http://item.rakuten.co.jp/male/300pi/

Makes me suspect that the reason the restaurants you have been going to have these squeezers is because they were promotional items included with bulk buys of pineapples.

Not sure if buying a few pineapples using the link I've included means that you get a squeezer as part of the deal.

If it does, you can ask your concierge to buy it on your behalf (they could keep the pineapples and just send on the squeezer to your home address). Alternatively, enquire if Noppin will do this for you instead (you may need to pay a little extra for the time required to unwrap and then repackage your item).