Is it practical to switch from tubeless to tubes every few weeks?
If you value your time at US\$20 an hour or higher, you’ll find you’ll quickly benefit by just getting a spare set of wheels, leaving the tires permanently mounted, and swapping wheel sets as needed. Otherwise, you have to clean sealant from the tubeless rims which make them a pain and buying a new bottle of sealant every now and again is going to start adding up. 

You can often find a suitable set of wheels by buying a used donor bike. Just make sure they’re true.