First off welcome to Xmarks

I think you could get away with wearing your kilt a little more than once a week. Depends on what you do it it. If you choose a Bear kilt these you can wash in a machine. Having said that..I haven't washed mine yet and it still looks good. I hang my kilts to air out before putting them away. This helps.
Another thing If you go "regimental" (without underwear) you may have to think about cleaning your kilt a little more than usual. Others my say different

I have begun to use a steam Gun I've too little expeience with them at present but others here use them.

Hector Russel reccomend you shouldn't dry clean a wool kilt more than Once a year

For a casual like a utilikilt I'm not sure ...Maybe just wash it when you think it needs it.

But wear your kilt as often as you like it's your's you'll know when it's time to clean it.
Ps.I have yet to clean my first 8 yard wool kilt ....It's three years old and get a lot of use.
Good luck I'm sure others will chip in with some advice soon too.