Could something from OSHPark and a few nylon rods work for this?
Another option (5pcs.) http://www.newestrend.com/3-x-aa-to-d-type-battery-adaptor-in-parallel-5-pcs-p-925.html

WarHawk-AVG;
Possible but cheap enough per unit that with materials cost plus your time I question whether worth it.
antiparanoico;
Same things except for plastic color so far as I can see. A bit less expensive but W/O the eBay customer support/guarantee. Either one appears to be a bargain. Yours a much better buy if don’t need so many.
You have to purchase a lot of 10 from Aliexpress:
$11.64 for 10
I bought 2x10 of these a while ago:
$20 for 10 and free shipping. Not certain they are the best for high drain applications, but they work very fine for my purposes.
I also bought a bunch of IKEA LADDA nimh AA and replaced all old D-cells in radios, old flaslights and other stuff.