Why not create the same battles/campaigns you like here? since you can't convert them.
Get into the editor and learn how to do it,it will take alot of work but can be done.
All the tools are there.
I'm not much help myself, since i don't know much about creating,but heading that way
I actually loaded SP1 a few times with Dosbox with the same intention of replicating some scenarios, it isn't an easy task, the suggestion of having the Dosbox window open with SP1 and replicating the maps is the best choice for replicating those scenarios. I'll definitely try soon to replicate some because I miss most of those stock scenarios. If anyone else or the cammo team itself is willing to embark on replicating any of the stock scenarios from SP1 i volunteer to help with map replication. I'm sure that others will be glad to help adapting and polishing the SP1 scenarios OOBs to WINSPWW2.