You don't NEEEED a topre tester..
BECAUSE
Topre feels almost exactly like regular Rubber dome keys.
The typical rigid older rubber domes are ~ 60g
The newer thinner cheapo rubber domes are anywhere from 30g to 45g
Topre will FEEL exactly like rubber dome.. so there's no reason to build a topre tester..
The typing transition timing will feel different on the Topre, and the board itself more responsive due to this.. but that is a product of the 2mm actuation point.. NOT the mechanical nature of the action..
the mechanical nature of topre switches are identical to the keys already in front of you.
Agree with TP4 that Topre are, in kinesthetic terms, rubber dome switches. Their electrical actuation (capacitive) is different from most common RD, but that is another discussion.
Nevertheless, my perception is that Topre switches feel significantly different (and better) than common rubber dome over membrane keyboards (i.e. the Dell keyboards at work, my cheapo Logitech keyboards plugged I use with my Raspberry Pis, my Microsoft Natural ergo keyboards, etc.). For me, it was worth the extra effort an $ to get a Topre keyboard.
Others feel differently, perceptions vary, YMMV and all that. Ultimately it comes down to each individual's personal preference and their willingness to part with money to get what they want.