I'm curious about your project that would use these seats - are you going for a full OEM 'new pure red' interior?
I am sort of a redaholic [emoji3]and lucked into 1 pr (of the 21) OEM red seats locally from 'Teej' this year. Also I have bought a lot of the small red bits from Acura.. and surprisingly those were all in stock. I didn't get the OEM carpets but they seem available from importers even in LHD. The transmission tunnel pieces are the ones that seem eyewateringly expensive and I just reupholstered the ones I had.
About the seats the red switches are available new and I think reupholstered seats in red with those would fool most everybody, even using the inexpensive seat covers out there. Given the rarity of OEM red are reupholstered red seats an option for you?