If you are really wanting that capability look at the new elite FS, even that is way overkill for what you are doing, Since structure is less important for trout fishing, ESPECIALLY in small lakes. Reality is you can easily do with the even with the hook or even less, it seems to be overkill to be spending that much money on sonar for jon boat fishing.
And just so you know where I am coming from, I have my own mobile marine service company, I am a certified NMEA 2000 marine electronics installer, I am a marine engineer, and a captain. I’ve been fishing my whole life have a dozen or so high end setups for fly, spin, cast, troll, and bottom. And really you don’t need a 3 in 1 for inland lakes unless you are targeting bass, but in BC that’s really not necessary as we tend not to need to do that like they do in the states. A more basic finder would suit you just fine, the retail on the HDS 12 with 3 in 1 is $4k which is probably more than what the boat cost. Anything that can find the bottom and spot fish is all you really need, I've gotten away with a fairly basic used hummingbird on my lake rig that cost me $200, I use it for choronomid fishing in the spring and trolling anything from wedding bands to leeches in the summer, it does just fine
also just FYI I have an Elite FS 9 on order thats going on my ocean rig, which is more fitting since I want a proper chartplotter that can display engine data, radar, ais, ect. The HDS is one step above that, I cant see a reason why an inland jon boat would possibly need those capabilites.