I am lucky:
Happily married with two kids and my part time business is a FFL/SOT.
So my wife does not even say anything when I get something outside the normal guns.
Today then prayers got answered:
Now even for FFL/SOT it is not easy to get a G18.
Beside the "love letter" you have to find one for sale and there are not even too many "Post Dealer Samples" out there.
The conversion option is not a good one. A friend with a manufacturing FFL changed on and after 1,500 rounds the gun started to fail.
So it is not an option, plus you have to be a manufacturer.