Box around SubCircuits

I know that this is probably an age-old question, just wondering if anyone has any magic out there.  I'm working on schematics that are really too small to go to a hierarchal design so I don't want to go there (only about 4 different 'sections' to the circuit) and I want to draw something that shows each section.  I know of a few options and have those below:

• Use wires to "draw a box". I don't like this option because it's really a hack that's been around for quite some time. The worst part is when you go to change a portion of the schematic inside that box, you can accidently drag a component onto the box wire, and now the box becomes part of your circuit, potentially shorting something out too.
• Use the "draw rectangle" tool. This makes the most sense as it seems like it's something that has been put there for this purpose, but if you draw a rectangle around something and then go to select a few components to slide them over and fit in that extra bypass capacitor, you end up selecting the box when you drag over those components and then you move your box. Worse yet is when you multi select a few parts to delete them and then hit the delete key, you also delete your box. I'm not sure why but it seems to have a transparent, selectable fill.

One last thing and this might be the missing piece for me. We (for reasons that I won't get into here) are still using 17.2. We have plans to move to 17.4 but I don't have any of those features quite yet.

If anyone has any thoughts on how to do this 'correctly' then let me know. Bonus points will be awarded to anyone that has a solution that then also forces layout rooms for the parts inside the box. Thanks in advance!

P.S. Just as a guide, an example of one of my boards has an input section with about 10 parts, two output sections with about 5 - 10 parts each and one main circuit with like ~50 parts. These all fit on one C-size page comfortably, so multiple pages ore hierarchy are really more wasteful and I would rather just have nothing than complicate everything with extra sheets.