I really don't see a lot of difference between a motion for sanctions and a show cause order other than the show cause to me would be an extra step, and needs more specificity.
In show cause, you have to be really specific about what it is you want, and you don't know what you want. Is it 1099's or a tax return he has? See? You want to know an income level but you can't name the exact document which has it. Google writ of replevin.
You want him to turn over information in whatever form it is and he has failed to follow numerous court orders for it already. What makes you think he would obey a show cause order? Huh, LOL? Then if he didn't obey it, you want - drum roll - sanctions! But that's what you want now. IMHO you are already entitled to sanctions or more important, the court is.
Subpoena the records from that attorney and if you don't, and don't post back that you did, it will be frustrating. I want you to have a statement from the attorney that he never got them to bolster your request for sanctions against the OP.