If you are willing to go to that effort it will work.
Brownells gunsmithing supplies has some lead type stuff that melts at like 150f. You melt that stuff and pour it in, bend it around anyway you want, heat it back up and pour it out.
It is really neat stuff.
On the cheap note, if you know anyone in the hospital supply section, the stuff that is in the package around the radioactive isotopes is supposed to be the same stuff.
I clicked on that link above, I think I have the model 1 and that is the newer updated one, I have the one that HF copied and you can get now for about $70.
Here is the lowbuck I was mentioning / speaking about. Goes up to 1 3/4 or so.
Williams Lowbuck Tools, Inc. Tubing Bender