I have no idea what a maat fight is like on Ninja, but I know it was pretty easy for me on WHM. Two tries to get him down, first time I just ran out of time and second time I went in with the game face on. So, if you did decide the WHM route.. its easy.
On the bright side of Ninja gear, a lot of the gear you get you'll be using for a rather long time. Lizzie boots are nice, but you replace them fairly quickly. However, if you do get them You'll at least have them for any other melee job you get and he's not camped much anymore I believe. He can be a stingy wench tho. Don't forget about the other ways to get tenshido fame. I mean there's the quests in norg, but there's also zinc in Bastok and that risky quest in ... I think San'doria.. where you smuggle goods on an airship. Just sucks if you get caught, but just something else to consider if you're tired of the yags.
I strongly recommend you making buddies (if you haven't already) with crafters. Tools will be a bigger nemisis than gear. (Gear you can always sell back... tools are gone forever). If you can make any of your tools you'll have a slight advantage, and if you can farm any mats and have a buddy hq ur tools you'll prolly help your pocket a bit. Hojo can be a bit pricy, and you can use that when you need a lil bit more hate.. but, I strongly recommend blinding your target at the start of each fight. It'll help with hate, save your shadows since you won't have Ni, and potentially make for a smoother fight. I don't find the wheel that great at Ichi, but it can be nice to weaken the mob if you have say a mage in the party/doing a skill chain, or whatever. Also if you have a cheep elemental tool it can be useful to sneak in an extra skill up or two. You will always want a second voke in your party til Ni. If you have another Nin/war or War/Nin you'll fly to 37 before you can blink (no pun intended) and thus, your main concern is keeping your katanas up to date.