this machine costs $1200

I'm wondering if I can cobble up something similar for half the cost?

the feed pen costs $125

Looks like the feed pen has a cigarette 12v power supply and some sort of data cable to feed the spool wire.

are there any miller wire feeders that would work with this feed pen? if not are there any that could be modified relatively easily?

I saw this wire feeder on ebay, but a search on it here yielded no results

i have only tig welded so I am unfamilar with mig gear. will be used to weld 16gauge aluminum with Lincoln PT-275 machine.

just looking to speed up production.