A BTC-5339 with double-shots? Lucky you, both of mine have pad-printed keycaps. Very worn, smoothed-out, pad-printed keycaps.
On top of that, they feel way too linear. Not clear as to when they actuate.
Finally, they commit the sin of the oversized Enter key, though the saving grace is that Backspace wasn't castrated to make room for Backslash.
Still, the PCBs hold some promise. Just have to build a different casing with different switches around them.