In that style, yes.
No, I think it's best you leave that one as it is (assuming it works okay).
And yes, the ceramic chips with the gold coloured detail do look smart
![Cool 8-)](./images/smilies/icon_cool.gif)
Would be interesting to see which ROM version code that ROM chip contains.
Also SGS Z80 CPUs don't appear to be that common in Sinclair machines (or, I should say, I've not see many myself, maybe others have seen them more often?)
Mark