Hello Phil,
Keith has indeed done a superb job with his wheels.
Black as opposed to the colour Kath has used? Personally choice of course, but to me gloss black just looks tarty and cheapens the car - opinions will vary!
Re. replicating Keith’s standard of work? Skill will certainly be required, and although you can improve on your yours, only you will be able to judge whether you can meet that skill base necessary to overcome the risk of any work being seen as simply a DIY attempt.
You say you had a good discount due to the car’s wheels needing to be attended to, so it may now be worth investing that discount in getting them done once and wisely.
Kind regards,
Gareth.