Tokamaks are inherently pulsed machines. No material will change this. Stellarators are very similar to tokamaks but do not use a central solenoid/transformer to induce the poloidal twist: they use the geometry of flux surface/coils/vessel. Stellarators are steady state.

Tritium breeding blankets have been the answer to question 2 for longer than I've been alive.

The real engineering challenges lie in divertor physics and strike point materials.