Add me to the "don't bother" column. As background, I have a Clipper Creek HCS-40 EVSE, which I bought for a Chevy Volt I drove before getting my Model 3. The HCS-40 is on a 40A circuit and charges at 32A. I've had my Model 3 for slightly under 8 months, which admittedly isn't all
that long a time; but in that time I have never come close to feeling that 32A was inadequate. Even if I were to return home nearly empty from a road trip and have to leave six hours later, the 32A would give me about 180 miles of range in that time, which would almost certainly be more than I'd need, unless I was heading out on another road trip -- in which case, Superchargers would take up the slack. (In
my first road trip experience in my Tesla, Superchargers were more than fast enough -- the car was charged to beyond where I needed it before I was ready to leave when taking meal breaks.)
Note also that upgrading the EVSE from your current 32A model to a 48A model will require replacing the circuit breaker, and probably also the wiring. Thus, there will be installation costs beyond just the cost of the EVSE itself.
Aside from speed, a standard J1772 EVSE with a Tesla J1772 adapter will do everything that the Tesla Wall Connector or Mobile Connector will do
except open the charge port door by pressing the button on the EVSE's handle. That's a cute trick, but hardly critical, since you can open the charge port door in several other ways (tapping it, using the Model 3's screen, or using the Tesla app on your phone). Since you'll have two adapters, you can leave one permanently attached to the J1772 handle and use it much like a Tesla EVSE handle. Unplugging requires either two hands or learning a trick to keep the adapter connected to the J1772 handle when unplugging: Push the button, release, then withdraw quickly; push the button
partially to stop charging without disconnecting; or use a small padlock (if your J1772 handle supports them) to help with the previous approach. You'll probably end up with the adapter alone stuck in the Tesla a few times before you get the hang of it, but it's not hard to do it right once you've mastered it.
There is one caveat: Although it's very rare, there are compatibility problems between the Tesla Model 3 and at least one J1772 EVSE -- the Siemens VersiCharge (or some variants of it, anyhow). See
this thread for details. I've heard of Blink in reference to its public EVSEs; this is the first I've heard of a home Blink EVSE. Thus, I can't promise that it will work with the Tesla. Probably it'll be fine. If you have problems, though, you might have no choice but to replace it.