Yeah just use the legendary weapon locks. An example is durandal. The sword itself has an attribute meaning only people with the durandal weapon lock can use it. Then vice versa Eliwood has an attribute that allows him to use weapons with the durandal weapon lock. So in your case just give your tome one of these weapon lock attributes and your character the attribute to use weapons with that lock.
Your weapon doesn't need to be the same type as the one from the original lock i.e. the durandal lock can be used on any weapon not just swords.
List of what locks I can remember:
(one more I think is for one of Athos' tomes)
Ohhhhh thank you very much!
I haven't thought of that.
Hmm, that's going to be pretty tough though, since there will only be 3 other weapon locks left for me to use,
since I'm already using a modified Lyn.
Wish there was more, but I'll make do with what there is.
Also, the locks are Mani Katti / Sol Katti, Rapier / Durandal, etc., so they're kinda bundled up together instead of being seperate, so there's only a total of 4.
((Aside from maybe the Wo Dao lock))
Anyway, thank you very much!