In Jain bhakti, the main aim should be devotion, purity, and respect for the Tirthankars, not entertainment.

• Using a popular tune for a Jain song is not inherently wrong if the bhav is sincere and respectful.
• But in a derasar/temple, people should avoid humming or treating bhakti like a film song.
• Temple worship should remain serious, शांत, and devotional.
• If a song is sung on a Bollywood tune, it should still be kept clean, devotional, and non-distracting.
• Anything that creates laukik feeling, glamour, or casualness should be avoided in the temple.

In short: Jain bhakti is acceptable only when the inner भावना remains pure. For temple worship, it is better to use traditional, devotional, and respectful style rather than Bollywood-like humming.

If you want, I can also give a clear Jain guideline on what is appropriate and not appropriate in temple bhakti.