This question hits the in between need for a regulator. While your
canister sizes are very small, regulators provide additional
than regulating gas flow. They also indicate if the
canisters are experiencing leaks.
Are you able to use larger volume tanks in your studio? If not, you
can obtain reusable tanks in the volume you are limited to. In both
scenarios, I still think getting at least a tank volume regulator is
a good idea.
Just make sure that with propane, your work area is well ventilated.
Having your friendly fire Marshal take a looksie at your setup is a
good idea. They want you to be safe and at those volumes you
shouldn’t have any problem.
Don’t forget your fire extinguisher either, which is rated as ABC.
Last thing. The Little Torch tips for propane/oxy have a limit on
the size you can use. They are rated for oxy/aceyt which has a
smaller molecule for gas than propane. If there is a red ruby tip at
the end for the 1 - 3, then you cannot use these for propane as they
are too tiny. The 4 -7 is fine.