Start with no hood/screens & all except AI & power instruments covered. Do S&L at various speeds with emphasis on trim & attitude + power combinations. Instructor occasionally expose the appropriate performance instruments to confirm/check that item then covers it again while a correction is made, followed by exposing it for a glance to check/confirm the desired result. Continue with climbs, descents & turns and manually exposing instruments at a suitable rate & pattern.
Then do the same again with hood/screens. Emphasis remains the same as previously.
Once satisfied with the student's ability expose the performance instruments. I used an old extensible radio aerial as pointer. As in 'follow the pointer' for where to look.
Apart from transient moments have your student remove his/her hands from the controls frequently. If trimmed correctly nothing much should happen. I often found lack of trim skill was due to holding the controls tightly.
Your student may not need to step so far back in remedial training so jump in where ever suits.