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I'm hoping there is something I can use in a module like N/ui/serverWidget instead of having to frankenstein the html

No all coloring/highlighting would need to be done ouside normal netsuite APIs, usually with jQuery

It is fairly straightforward jQuery, though, something like
```jQuery('#insertSublistIdrow' + line).children()[i].style.setProperty();```


For anything nontrivial,I recommend a SPA over a UI Suitelet provided the account has SCA or SiteBuilder

then you have complete flexibility over what's rendered how