Turning the results of a 2–7 on a d20 to a result of an 8

Is there a way to use a macro to change a result of a d20 so that it essentially has faces of 1, 8, 8, 8, 8, 8, 8, 8, 9, 10, 11, 12, 13, etc? I've figured out how to do this with a rollable table, but I'm wondering if there's some solution which doesn't require the GM to set up. Preferably, one which preserves the critical failure highlight of a 1 and the critical success highlight of the 20, with no other numbers highlighted.

It's a bit of a mess of a tooltip but this will work in place of your normal d20 { { {d20=20cf0} }*20 + { {1d19>9cs0cf0} }*{d11cs0cf0+8} + { {1d8>2cs0cf0} }*8 + d1cs0}k2 It works by checking in turn if you've rolled 20, 9-19, 2-8, or 1 and returning the appropriate value with highlight as required. There is an open suggestion for Custom dice syntax that would make this trivial, so consider voting for it.

Thanks so much! It looks complex, but I think I understand it. (Not that I necessarily need to understand it to use it.) I've already added my upvote to that topic some time ago.