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Maybe not that expensive, you can order free samples from sites like Alibaba. Here is one example, you could order 1000 headphones for 500 dollars. I'm sure you could make smaller orders too. Just keep ordering freebie samples until you find the one that fits, then order all these cheap headphones.

http://www.alibaba.com/product-detail/for-iphone-6-6plus-earphone-with_60225134784.html?spm=a2700.7724856.35.11.XEEWLC&s=p

Well, I have little skill at soldering, etc., so I have just avoided the plans that I've seen for adding a Bluetooth module to a keyboard. :7)

I know that getting power to the thing would be one issue.

Have you shown this to Prof. Dad to see other he goes pale? http://hackaday.com/2016/09/04/convert-any-usb-keyboard-to-bluetooth/

If they cannot be used as laptop anymore, you can build emulation arcade machines with them :

• install linux
• install MAME
• build an arcade cabinet
• fit the screen + motherboard + PSU from the laptop in the cabinet
• expose usb ports to plug controllers

This is an idea for laptops that are too old but are still able to emulate games, provided the OS does not eat all the resources.

CAVN Angle Mount Compatible with Ring Video Doorbell Pro (Can Create 15/30 / 45 Degree), Replacement Adjustment Mounting Plate Bracket Wedge Corner Kit with Screwdriver and Screws (Black) https://www.amazon.com/dp/B075YNZ5SN/ref=cm_sw_r_cp_api_i_ImNgFb4Q910ZJ

It did work pretty well actually! I got these: DAOKI 5PCS High Sensitivity Sound Microphone Sensor Detection Module for Arduino AVR PIC https://www.amazon.com/dp/B00XT0PH10/ref=cm_sw_r_cp_api_i_cguyFbS9H3RDA

And they were slightly touchy (but you can adjust them) but worked well!