there also tools. e.g.

1. https://w-shadow.com/bookmarklet-combiner/
2. http://blog.kafene.org/bookmarklet-combiner/bookmarklet-combiner.html

Works pretty good for small, not complex Bookmarklets

not for my pretty large bookmarklets.

e.g.

http://w-shadow.com/bookmarklet-combiner/?bookmarklet=44112

BTW i also not found a Bookmarklet-Creater that works correct (without errors later) on large/complex Bookmarklets