What do you do if there is a subjunctive trigger that is followed by the imperfect tense?
There is in fact an imperfect subjunctive, however it is rarely used and can only normally be found in technical pieces of literature or criticism. As a result, the present subjunctive is what would be needed here.
ZL
Related French A Level answers
All answers ▸How do you know the gender of French words?
When do I agree the past participle when using the passé composé?
Which of the following sentences are grammatically incorrect, and why? 1) Elle lui a dit de la laisser car elle est fâché, 2) Elle l'a dit de la laisser car elle est fâchée, or 3) Elle lui a dit de la laisser car elle est fâchée?
How do I decide whether to use the perfect or the imperfect tense?