yes, you can apply heat with a hand held propane MAPP torch.
Keep this in mind:
aluminum melts at 1,221°F.
a MAPP gas torch can heat the aluminum up to 400-700 degrees.
after the heat is applied, it decreases the temper called annealing.
then you can hand form the softer version of what you started with.
after the metal has been annealed, hammering and bending will
"work harden" it back to the original condition and then it may crack.
so you need to find that thin line between the two.
Dale H. just finished up a nice project where he fabricated a whole new transom skin.
maybe you can gain some information from his project.
https://forum.tinboats.net/viewtopic.php?f=3&t=37548&start=15
YouTube also has a lot of DIY aluminum techniques
https://www.tinmantech.com/education/articles/aluminum-alloys-annealing.php
using the correct tools for the job will provide more favorable results.
.