If I were to go to the trouble of installing any of the above, I'd go with the oil cups with the lids. Have a strange soft spot for them. Reminds me of old fashioned electric motors. But seriously, this is a Vevor arbor press, not a fancy machine at all. Have enough stuff to upgrade, this is practically at the bottom of the list!
Have to say, adding the hand wheel (for the life of me, can't locate where I bought it) made a huge difference. The wheel handle has a nice smooth bearing and it's pretty easy to crank up or down. So I place the parts, crank the handle until the ram is holding everything firmly in place and then use the lever. Could it be more refined, sure, but it is fit for purpose, so that makes me happy to have it.