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Is it safe to assume that those chinese 12 speed 11T-52T casettes that look alot like hyperglide (read: not looking like microspline) and are abundant on e-commerce platforms are build to MTB stack height specification and thus will fit your old shimano 8-10 spd road freehub ?
I believe its only a matter of getting hands on a SRAM eagle gx RD and figuring out cable pull and there you go 500% casette.