I have heard people say the sequences are harder now but I am not sure that anyone has really looked at older sequences. The figures are somewhat different and the combination of figures tended not to require as much power.
I have the Advanced known for 1984 and it is 17 figures and includes negative flicks on inverted diving 45 line and full vertical roll with stall turn ; about half the sequence is inverted and there are pushes to vertical halfs and a push into a tail-slide. Far harder than the 2007 Advanced Q programme.
However, whilst I think an Eagle would not struggle at Advanced and a Cap 10 would, (the Tiger Club will not let their Cap 10c fly Advanced and for their club competition this year used last year's intermediate because they deemed this year's intermediate too stressful for the Cap), you're certainly right that an Extra would be easier and for a given level of skill would score better.
Problem is there is no PFA two seater which matches your requirements.