I have a EHX Headphone Amp... more durable than those VoxAmp plug things, it works well after pedals etc. But is very sterile as no cab sim etc.
https://spartanmusic.co.uk/products/electro-harmonix-headphone-amp
Artec used to do an On-Board headphone amp, but again sound like an instrument, not an instrument into an amp, cab, in a room.
Zoom B1 on or B1 Four - They can be as Complicated as ya like, Simple Quality Best Solution.