Flew with an instructor in a C152 a few years back who was obsessed with 'stick & rudder' skills nearly to the exclusion of all else (he had an aversion to anything 'modern'). All I can say is that I felt decidedly sick afterwards so be careful what you wish for.
As you appear to be part way through your PPL, don't get overly worried about it. You will (or should) have Power-Attitude-Trim drummed into and that is the key to good accurate flying (in conjunction with the balance ball) no matter what you fly.
That you are thinking post PPL is a good sign - it is really only a licence to learn and many let their standards drop or stop flying completely after getting their PPL.
Concentrate on flying as accurately as you can and once you get your PPL and have built up some experience try a few other types. Older types, as you say, can improve your handling. There are also aeros, tail dragger, IRR courses to look at and all will help.