can i swap my qr style thru axles for bolt on ones?

[boomforeal]

last year i bought a used used gravel frame and fork, which came with 12mm qr-style thru axles front and rear. the front thru axle threads into what looks like a metal insert in the carbon fork, while the rear thru axle threads into an indexible non-driveside nut

over the last few months they've both loosened off or opened up intermittently, despite repeated efforts to keep them cleaned, greased, etc. and they require what seems like way too much effort and precision at the lever to get the cam to cinch things down without play/slop

so my question is: can i simply replace them with straight-up bolt on thru axles, or is there a chance the frame and/or fork was designed to require a qr/cam style axle?