Obviously, everyone has their own sensiblities about everything, but FWIW, I have ridden without a lockring often enough to know that it is perfectly feasible, not necessarily ideal, but feasible.

Putting the chainring on the inner side of a crank doesn't always correct the chainline. See the post in this section recently titled "chainline" for more info on that. There are many different ways to correct chainline. OneTinSloth's method is perfectly workable, as is putting a spacer behind the cog on the hub.

The most expensive way to solve a chainline problem is to go out and buy new cranks or a new bottom bracket, and you better have your numbers straight(axle end factors, etc...) b4 you do that or you're going to be throwing your money away.

And if one does what you suggest by moving a spacer fron the drive side to the left side of the hub, the wheel will have to be re-dished. See OneTinSloth's idea.