This should not harm the unit, but it may not get the capsule hot enough to vaporize your materials.
Yes, all inserts are compatible with any Ti cup.
Okay, just tried and I can confirm it definitely does not work. Dr Dabber should look into something like that concept for the Switch. I don’t use mine for herb because it’s a hassle and a mess, just like many herb vaporizers - no offense to anyone here. The capsules clean up the mess and allow you to schedule the hassle for when you’re not getting high.