What companies 40 mm are you using? I ask because if I ever need to go 'up scale' I plan to skip to 40 mm. And, getting older, that may need to happen but not quite yet.
They are a real mix , Roughly 45% Fronk Rank, 35% Trident , 20% conversions but usually nothing complicated.
I know Sean Judd who scuplts the Trident 40mm
who kindly passed on many figs that were never released or one offs . Alec at Front Rank started 40mm as a commercial venture but also for himself . I have asked Alex if he would sculpt Highlanders in trews pay him upfront but he is reluctant as commercially 40mm has been a damp squid.
Both have there strengths , l think you have to be selective. Front Rank excel as formed lines units and Trident work as skirmishes, Indians etc.
The rules are blurred as my French Line are Trident with some head swaps for variety.
Doug of MSC has visted me in Blighty but at the time l hadn't bought the farm with its extra space for my set up .l think he is not too far from you
Kind regards