As someone who has been doing Barrelsmiths Sorc since forever I agree: casting two skills with Ulzuin’s Chosen is indeed a lot of “fatique”, it feels clunky and sometimes it interrupts other casts, sometimes ulzuin’s chosen skills interrupt other casts.
And yeah, software can trivialize that but not everyone wants to use it or use macros.
I like op’s suggestion here, although I doubt Crate will make such a drastic re-design that late in the game.