I have replaced clutch assemblies only on compressors with no issues.
The reason for a shop’s hesitation is that too many people (and I’m not saying you are one of them) will willingly agree to a clutch only repair and made aware of unintended consequences.
When the aged compressor gives up a month or a year later the same customer will scream bloody murder that the shop screwed something up and bad mouth them to everyone on the planet.
If you can DIY and the A/C is currently cooling fine I don’t have an issue with a clutch only repair.