I don't have a case trimmer either. I have a lot of equipment to get.
Ok, I will be up front, I have a fixed in stone view on this. Off the shoulder trimmers are the only way to go.
The trim, chamfer and deburr are the only way to go of that type.
I have a Trim it II now, will see how it does on multiple calibers, problem is you have to adjust the trim.
It is easy to adjust the blade though, nice job, have not got enough stretch in the 7.5 I ordered the adaptor in to try it.
I may order another adaptor (I have two of the Gérard Tri Trimmers, wonderful tools, only issue is you can't change calibers though they will work for multiple common shoulder cartridges)
That seems to be the poor mans best option.
Chuck it up in a drill, turn drill upside down, clamp in vice, set the trigger on, you can produces like the Gerard Trimmer.
Gerard makes what they call Tri Trimmer for a dill, very good, about $100 each. So if you get into multiple calibers? Yep, pay the price again. Also easy to adjust but not as easy as the Trim it II.
Last: If you really plan on more than 4 calibers,
Gerard Motorized Unit: All the advantages of the rest, its own motor and you can get adaptors and change in a matter of a few minutes.
With all of them you can process a case in about 5 seconds total.