I don't think you're going to find a semi-fluid grease in a tube, for obvious reasons. A 35 lb keg (5 gal) is lot to buy if you only need 2 oz. Semi-fluids are primarily used in industrial applications, so you'd be more likely to find something equivalent at a NAPA than at Manny, Moe & Jack's, if you're going to try the auto supply route.
ExxonMobil tends to work the high-volume customers; a company that big loses money trying to supply small shops. See if one of the brands that supplies local machine shops has something equivalent in a smaller size. Lubriplate comes to mind as a possible supplier. (Or contact ExxonMobil for a sample of Mobilux EP023, it will probably be enough for multiple change-outs.)
As for compatibility, grease incompatibility is almost exclusively caused by soap incompatibility. I can't remember running a study where the soap chemistries were comparable and the assessment was not 'compatible'.
So, when looking at a replacement the two most important aspects are soap chemistry and NLGI grade. You'll want a lithium or lithium complex NLGI 000; there's no negotiation on those points. Base oil vis is next, the 320 would be preferred, but you'll probably survive with a 460 or 220.
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