Engine Oil Cooler Install

Recently found out that the engine I'm building up has a partial block fill, so I'm wanting to add an engine oil cooler just to make sure my oil temps don't get too high.

Looking at using this sandwich plate: https://www.summitracing.com/int/parts/ear-510erl/overview/

and was wondering if anyone has used it in their setup? Does anyone know if you still use the stamped oil filter plate with a sandwich plate, or does the sandwich plate go right to the block? If I'm going to be using the oil filter plate I'll probably be upgrading to this one (https://www.summitracing.com/int/parts/ctr-22-575/overview/) as my stock one is seeping a bit, even with a new gasket, so the o-ring will be a better option I would think.

Ideally I would love to find a sandwich plate that has oil cooler line ports AND a port for oil temp, as I'll be running an aftermarket oil temp gauge. I always see a bunch on Ebay, but wonder about the quality. Has anyone had luck with the 'cheapie' ones from Ebay?

Lastly, as far as plumbing in the cooler, has anyone used anything other than AN fittings (IE barbed fittings, clamps, and hose)? I have a tru-cool cooler that was used as a transmission cooler previously and am hoping to flush it and use it for my engine oil setup. Would anyone think there'd be issues with this?

Thanks for any and all info!