The geometry is so aggressive I’d assumed it’s beyond anything a taller stem could solve, but this is a good idea – I’ll take a look.
Assuming we’re talking about an old road bike, then yes you can just swap to either flat bars + cantilever levers (because V-brake levers, aka. linear pull, have the wrong pull ratio) is a comfortable option, albeit it makes the steering a bit quick.
Failing that, and suggesting what you own. Have a look for the aluminum version of the Charge Plug, it’s not a harsh frame at all and takes 40mm+ tyres. I’ve got a singlespeed one set up as a fixie for long commutes upto 25 miles and it’s the best tool I’ve had for that job.