This philosophy of tiddlers has being challenged many times, and in my view never successfully dismissed.
- A key facility to help is improving the handling of multiple tiddlers, including export/drag and drop.
Well; that is an excellent skills development opportunity and once you can, it is very empowering.
This is a great goal and there are different ways to handle it;
- Personally I would make a package that the user can drag and drop or export that includes their modifications
- I would be inclined to look at a plugin of source data + user modified tiddlers from the above + a few additional user interface or settings tiddlers.