I believe you're correct about 90 bushido always letting you use nerve strike. That's a true statement.
The new proposal sure is light on mana regeneration, however. I humbly think you will find your mana pool problematical.
Also with 90 bushido your lightning strike won't give you many criticals, but it will still give you the maximum hit chance which is a big part of the benefit.
You've gotta play what's fun to you, so if you like your proposed template, do go for it and try it. But I recommend at least you do the poison part last so you can see how you like gm or less meditation.
I think even GM meditation is light recovery for a mage
