I wouldn’t say that’s a stupid question, and the short answer is yes.
Caveats might be that de-soldering would be significantly more difficult, or if they aren’t the lower-profile ones, you might end up with a PCB of switches sitting a fraction of a mm too high. If everything fits and you don’t plan on changing things later, there’s no reason why the joints wouldn’t be solid and functional.
Soldering in general:
Agreed with @sarvopari; if you can lube stabs, you absolutely possess the manual dexterity, visual acuity, and common sense necessary to solder. I have a feeling you’ll find it shockingly easy, and have a chuckle to yourself about it. Find something to practice with, arrange some good ventilation, and have a little fun picking up a new skill.
Now, de-soldering… well. With that I’m in agreement with @blackriver - that activity is disproportionately not fun in comparison. A motorized gun (brrr) helps a lot - like… a lot… but it still kinda sucks. (D’oh - no pun intended) Definitely one of those disciplines that takes genuine patience and a fair bit of care.
I’m 100% confident you could become proficient at it in an evening; it just tends to be a slog. 
Soldering in context of personal keeb builds:
I love my hot-swap boards and use them the vast majority of the time, but there is something satisfying about a build with a sort of “bow on it” - when some switches and a chassis come together right, it’s nice to lock-in that gestalt with a little solder.
I think of the hot-swap boards as platforms; my [ keyboard ] with [ today’s switches ]. For a personal build, once I find some things that I really like or that I think work well together, that’s when I might move to a soldered version of the same PCB, or to an otherwise similar soldered keeb to edify a favored configuration. Instead of being filed in my head as my [ x model ] with [ x case ] and [ x switches today ], it’s more like my [ numerically unique, individual keyboard ].
With some platforms (including a couple of my favorites), both hot-swap and soldered PCBs are available - and for the KBD67L, I picked up one of the latter for myself with a particular plan. When I’ve tried all the plates and padding configurations I care to try, and when I’ve tried enough switches to find at least one I’d love to always have in a build, I’ll take that configuration and put it together as a permanent build to have alongside my constantly-changing hot-swap daily-drivers.
As for my build process, I’m gonna say it sounds a whole lot like @pixelpusher’s 
)