A local photography group I belong to had the opportunity to play around with the Omni Creative Filter system from Lensbaby...which so happens to be manufactured locally.
https://lensbaby.com/products/omni-creative-filter-system
The first one was using their full system, but I didn't find it useful on a wide-angle lens 15-35mm w/82mm filter thread, however it worked great handheld for a phone capture...albeit it is a bit of a challenge holding the phone and filter while trying to touch the front of the phone to activate the shutter. 5-second shutter to the rescue.
These were shot using either the crystal prism or crystal pendant.
It's had to tell without seeing comparisons with/without the filter system but on first glances the filters in general appear to add a softness/glow to the images.
Were all these shot on a phone? One tip on the phone shutter release - I have been using a recently purchased camera grip (see my blog entry https://www.alanbrownphotography.com/blog/snapgrip-pro-review) for triggering the shutter via Bluetooth.
This can be done with the grip attached to the camera (for a much better camera phone experience), or even remotely.
Other remotes provide this option, but this one has performed way better than another I have purchased in the past.
Thanks for testing this out and sharing results with others.
Photo 1 was shot on an Canon R5, the rest were shot on a phone.
I have found my touchscreen erratic in shutter activation. User error most likely. I like "your" solution.