83.8. For the purposes of an order made under section 486.3 of the Criminal Code (R.S.C. 1985, c. C-46), the selection of counsel must alternate, insofar as possible, between an advocate referred to in subparagraph 1 of the first paragraph of section 83.7 and an advocate referred to in the second paragraph of section 83.6 or in subparagraph 2 or 3 of the first paragraph of section 83.7.