Hey Andros,
ANY Makita hand trim router that is offered outside the U.S. comes with a 6 and a 8 mm collet.
You can buy them as Makita spare parts anywhere outside the U.S.:
Milling bits in Imperial/U.S. Customary units are uncommon outside the USA (and partly Canada).
Goran tek-en, CC BY-SA 4.0, via Wikimedia Commons
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In the big “non-US” country I live in (shown in blue), for milling motors up to 2.2 kW, we commonly use bits with 6, 8, 10 or 12 mm shanks for ER-16 and ER-20 collets (that I buy from spindle manufacturer or from CNC equipment suppliers) that are found on three-phase induction motors (aka spindles) and also on some of the “Euro” mount (43 mm) milling motors like …
The Makita hand trim router does not accept ER collets! But outside U.S., the Makita hand router is always sold with 6 and 8 mm collets.
See also here for a direct comparison of Makita proprietary, and (standardized) ER collet