I use many cameras that do not contain a lightmeter, from TLRs to a 6x24 homemade pinhole. I use 2 lightmeters: my phone and a Pentax spotmeter V.
Honestly, I get the allure of reenactment, but old photo gear is good because it's often very well manufactured, has good optics, and even a tiny format like 35mm will resolve with more detail than all but the fanciest digital stuff. Old lightmeters are typically worn out and not good, and not fun to use.
For an incidence meter, something that averages incident light over a large area, any number of apps, both free and paid, work well using the phone camera. Its what I use about 90% of the time. Especially as I don't have to do the math for pushing, pulling, and I can even tell it the aperture is f240, which doesn't appear on a physical meter.
The spotmeter V is a one degree meter that takes readings from a very narrow, well, spot. Instead of getting an average of an area, you can set your exposure with specific information. Very good for high contrast situations and mandatory for using Adams' zone system. But you probably don't need one unless you're going all out.
Seriously, you'll feel funny whipping out your phone just to get a reading to take an analogue photo, but it's by far the easiest way to do things.