For a couple of years after discovering Shotcut I couldn't get versions to run under any current Puppies. Some older versions could be run under Wine. But the last couple of iterations do run under some recent 64-bit Puppies*, 'though perhaps only debian/ubuntu-based. Additionally, some straight-forward tutorials/guides and even video 'how-tos for Beginners' are available. Google for them. Note, there's no 'r' in shotcut.
AppImages and 'Portables' can be obtained here, https://shotcut.org/download/.
I downloaded 'the portable' and extracted it. Within the extraction folder was a script named 'shotcut'. I think permissions were already set as executable by 'all'. Clicking it opened the Application under Bionicpup64. There are other scripts --ffmpeg, melt, qmelt, etc.-- apparently relating to the files in its bin, lib and share folders.
I currently do not have a working version of any Slacko64. But the modular nature of the shotcut 'portable' --including its utilization of scripts to bind its files together-- suggest that even if it can not be run under Slacko64 OOTB some inclusion of missing libraries and modification of the scripts may be able to produce one.
* There are new 32-bit Window versions which might (untested) run under Wine.