Yes, more 071s might have been a compromise; bear in mind that these matters were decided by politicians, rather than anyone who knew anything about the industry, or railways!
An earlier version of 201s, perhaps..... Those ex-"C" class B201s could have double headed ti get things started, I suppose.
Always thought that a layout based on 1980s / 90s NIR but with internal freight and lots of locos would make an interesting project - Hunslets, ex-CIE "C"s, the English Electric shunters, a "celebrity" "WT" class 2.6.4T, and 111s.....anything would improve the monotony of nothing but 70, 80 & Castle class railcars!