It would save a bit of space if the portable versions of CCleaner, Defraggler, Speccy and Recuva could be put into one folder with a common Lang subfolder and portable.dat file.
Even more space could be saved by removing files in the Lang folder that are not for the user's language. The current portable versions total 42,094,122 bytes and 186 files.
It wouldn't need anything like an integrated launcher or combined functionality, just eliminate duplication amongst the four programs.
Actually you can just remove the lang folder (except your language if it differs from english) and you'll be set,
[opinion] the reason that can't be such a folder is portable could be anywhere, [/opinion] i.e. I might have m:\cleaners\ccleaner\ccleaner.exe and m:\system monitors\passive\speccy\speccy it would take a lot of work to get those to share a folder, on a drive that tomorrow on another computer might not be M:\ it might be e:\ or x:\
I do not think this is possible because there are not the same files for C Cleaner and Defraggler, for example. However, I think it would be proposed that C Cleaner to delete all same files for other programs. We could delete hundreds of files.