Wheel Studs and Spacers

Remember that time some random dude swooped in on your thread and kinda hjacked it without helping out at all?

Here's the situation I'm dealing with- 10mm spacer results in not much thread showing (see picture)

I heard you need the width of the stud in thread depth as a rule of thumb, though 7 turns sounds more accurate. I don't even know if I've go that.

And the problem I've found with studded spacers is that they only come in wider width than will fit...