Thanks JohnnyAppetizer. In fact, I have added a DIY riser, using some stainless steel nuts and bolts. I've trimmed these down a bit to (hopefully) find the right compromise between creating distance between heat source and food, and keeping some room in the dome for a decent cut of meat. I can flip it over for regular, direct grilling. Haven't tried it yet for slow and low but will be debuting it this Friday, fingers crossed.
Pics attached.