Is it practical to switch from tubeless to tubes every few weeks? Part of the allure of a gravel/cyclocross bike has been the possibly of having a "do it all" setup.  I recently purchased a gravel bike with 38c tubeless tires on it, and I also have a set of 30c tubed/clinchers.  I don't have any experience with tubeless but from what I've read they seemingly are a bit tricky to get setup compared to a clincher.  If I have the right equipment (air compressor, sealant, levers), how practical is it to switch between tubeless and tubed depending on the terrain I plan to cover that week?  Ideally one complete swap every month or so, tubeless knobbies for most training (16mph/25kph) and tubed slicks for events (20mph/32kph).
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.