Khmer is quite complex, and isn't on the list:

https://en.wikipedia.org/wiki/Khmer_numerals

Up to 30, it's got a base-5 component so, for example, 16 = dap pram muoy (10 5 1). From 30 onwards, like Thai it follows the more straightforward Chinese number system.

The numbers in Scottish Gaelic have recently been changed and are now base 10:

https://gaelicgrammar.org/~gaelic/mediawiki/index.php/Numera...