You can change the size of anything displayed in the UI. I haven't had a chance to test max sizes, and I don't have a UHD TV so I'm not sure what size would be appropriate. Here is the pull out of an EQType display in the UI, this one being current wieght, you would just change whats in the size tag.
Code:
<Label item="PW_CurrentWeight">
<ScreenID>WeightNumberLabel</ScreenID>
<Font>1</Font>
<RelativePosition>true</RelativePosition>
<Location>
<X>92</X>
<Y>79</Y>
</Location>
<Size>
<CX>30</CX>
<CY>10</CY>
</Size>
<EQType>24</EQType>
<Text>500</Text>
<TextColor>
<R>255</R>
<G>255</G>
<B>0</B>
</TextColor>
<NoWrap>true</NoWrap>
<AlignCenter>false</AlignCenter>
<AlignRight>true</AlignRight>
</Label>
But you need to realize that just changing the EQType size is just the begining, you will likely need to adjust its location, and probably the size/border of the UI item itself.