What makes the kiss Holy is the indwelling presence of the Holy Spirit, and His guidance/influence on the intention for the kiss. It is not a full body press, lip lock, tongue wrestling contest.
For me, folks can simply touch cheeks if they want........and before Crossnote says anything, YES........Face cheeks.......shake hands, or men loosely embrace men and women, women........
Some people are not comfortable with such, so one should not impose this custom upon them.
Remember: This is a "custom," not a Biblical Commandment.