Is this a correct sentence: "It can be more expedient to supplement the diet rather than improve it."?

Question

While there may be other issues I'm specifically interested in the use of the word "expedient". To me this sentence sounds off, can something be "more expedient" or is something always either expedient or not?

Context

I'm trying to express that sometimes when there is a lack of a certain nutrient in a persons diet the faster and easier solution in the short term to is to supplement the missing nutrient rather than spend the time finding good sources of foods the person enjoys eating.

If you have any feedback on my english or grammar in this post I'm also interested in that!

Solution 1:

Expedient = (of an action) convenient and practical although possibly improper or immoral. E.g. "either side could break the agreement if it were expedient to do so."

As a noun = a means of attaining an end, especially one that is convenient but possibly improper or immoral. "the current policy is a political expedient" (Source Google). You may review accordingly.

As for the grammar part, "more...rather than" sounds needing improvement. It should be "more...than" or "rather...than"