Transmission oil cooler: stock front radiator vs aftermarket frame mount?

2016 cascadia with a eaton 10 speed

So, I've been running without a transmission oil cooler for a while now because they bypassed the leaky lines going to the front radiator when I had my transmission replaced.

However, I've noticed that the transmission is getting very hot to the touch after running and I'm thinking it's not a long-term solution if I want to keep this transmission...

Should I just replace the lines to the radiator and keep this failure point?

Or should I get one of those aftermarket frame rail mount, air-only, trans oil coolers instead, and remove the concern about coolant mixing with trans oil, etc?

Or should I just keep running it as is and just change the transmission oil every year?

 

I'm not advanced enough to be jury rigging multi vehicle Frankenstein contraptions unfortunately, but I did just buy this thing...

HAY/026744 Transmission Oil Cooler – 10-4 Truck Parts

 

That's what I figured. My mechanical skills can best be described as " enthusiastic amateur", so I wanted something that I can easily bolt on without having to improvise too much mounting weirdness.

Unfortunately this thing doesn't come with hoses, I'm going to still have to have somebody make me a couple. Or maybe Napa has some standard length pre-made shorty ones.

 

My truck literally doesn't even have a transmission temperature gauge unfortunately. It's an ex fleet truck. However, I live in Nevada and I try to stay away from really cold parts of the country in the winter, so I should be all right