Oddly, the same topic emerged on tinycore forum some time ago:
More recently, I was planning to simply use the sd card to swap; they are just cheap: 5 euros (even less) for 2 gb.
That would be slow, but not much slower than the bottleneck imposed by usb2, and things would vary depending on the SD class (by the way, that of SD classes is a tiering system I find ambiguous).
I estimate that months have to pass before the first wearings, then you buy another one.
By putting the OS on a partition and the swap on another, one should have an easy time in transfering the first on the new SD.