An Elliason rear sight will probably fit and replace the Accro, at least it does on Python, older Gold Cup, and Ace.
The only way I know of to get a fibre optic front sight on a Trooper would be to have a gunsmith make a dovetail cut across the ramp and install the nearest height 1911 f.o. sight.
Millett makes sights for the Trooper Mk III, you could get their white outline rear and blaze orange front. Certainly the simplest and least expensive option.