Ideally, they would get stock indirect fire (UC mortar conversion), stock heavy indirect fire (LM or other type of rocket arty to stock roster and create something new for the commander), an AI light vehicle to replace the Bofors tech (pick any armored car or the Valentine and replace that in the commander), completely rework Bolster, etc. Then most holes would be fixed while staying unique enough as a faction, but there obviously is no way to do this without a dev team or even proper mod tools to create new assets.
Outside of a model for a Uc mortar carrier, what exactly "new assets" do you need ? Following your saying i see almost all the elements needed are already exist. We have an observation officer that can replace the valentine if it become stock, rework bolster dont require any new models, just about 2 new icons and 2 new symbols at best, land mattress only being in 1 doc and can re replace with an off map if become stoc, etc.
In the past i heard sb said that relic dont allow you to change the brit, but then we have usf rework and okw rework, and now you are here, talking about how tools limitations prevent you from doing the right things while you are fully aware that those things should be done. Like "we cant fix brit because we dont have assets" sory, but with all the respect for modding team, i think this is so lame for a reason. Talking right from what you said, event i can turn those changes into a mod within a week, then we can spent 1-2 month for pp to test it and fine tune it, then it is done. What seem to be the most complex task i can think of is to calculate the effects of the changes and balance things out, but With an elite goup of modder like you have, what can be so difficult outside of someone being lazy and dont want to take the risk ? What is the true reason ?