I wish there is such thing. I've never found a shop that can do custom jobs like these.
The cheaper project is now on hold, still on hold, because i still can't get it to boot. The seller hasn't replied to me whether it's faulty or not.
This wont exactly be cheap, but it sure is less of a headache. I've just received 2 device that's like the worlds cheapest phone.
Left - Dual Sim. $15
Right - Single Sim. $10
So now i'm considering if i wanna buy more of the dual sim and keep the sim in there, or the one on the right, single sim, but easy to swap.