The 5 lathed down E3D heatsinks are the most expensive parts of the 5er diamond hotend. The nozzle itself is only ~16$.
Ender3 heatsinks are small enough to fit side by side without any modification.
Not only cheaper, but it allows you to use different heatbreaks. The original one has 4.1mm bores to completely route the PTFE tube through, I think.
I've been printing for a few weeks now with this setup, even challenging parts with lots of retractions and unused colors idleing and hydrolyzing,
but no clogs.