probably one of the reasons why we don't have a dark age iteration of the tactical handbook / max tech / tacops. IO adds and consolidates some experimental gear, but it's not on the scale of a full-blown experimental tech book - and a decent portion of it is "flash in the pan" type stuff like the RISC series.
Imo we're at the point now where in the 3140s and beyond, clantech should be filtering in and replacing the myriad of IS options and the new wave of tech innovations should be improved versions of that consolidated techbase pushed out by the sea foxes / wolves / bears / shadowy research labs
Realistically speaking, Clan tech should have been being produced in the Inner Sphere, by Spheroids long before it was. Unfortunately the game and general RW peacetime have influenced this well beyond it's usefulness to the plot.
WWII proved, with amazing clarity, just what a pressed nation will do when they are under threat, including development of brand new industries and their attendant feeder industries (I'm looking at you, aviation). That was
five years!. In 15, such as the truce with the Clans, at the very least the DC and FC/LA would have commissioned a full Clan tech manufacturing system, particularly when you consider that the reintroduced technologies would have faced similar issues. Cost is no issue for a nation facing devastation, that's something to worry about once hostilities cease.