Well from my experience I always used 120 volt heating and not appliances: portable range, sunbeam fryer, lamps, percolator coffee makers (including small motor ones my osterizer blender, Sunbeam Mixer, conair hair dryer etc...) with simple portable voltage converters 1850 watts and other one 2200 watts, it is years we have these appliances used regularly and we never had a problem with the difference of Hertz they works just like they should ,just the voltage gets converted with these converters not the hertz, specifically about the matter we're speaking of I tell you I have a 1100 watts portable electric burner range since 5 years and element works just like it should....
I knew the difference of hertz may become slightly dangerous for certain appliance types and if are used continuosly all the time (for ex a refrigerator compressor)...
I've read that generally this is not a big problem when you use a 60hz hertz appliance with 50hz, more if you use a 50hz with 60hz...
So I guess even a full size electric stove should not suffer the difference of hertz, I can just speak for my experience with my appliances, I'm not a tech but my appliances never did...
Here are some info I've read, not sure if fully correct:
I remember I've read once in an tech website a discussion (a girl asked how to run a 115 volt KA mixer in Italy) that a part the obvious converter suggestion, they stated to buy a japanese converter to convert 220-240 to 100 volt, they said that if you're using 60hz appliance with 50hz a general suggestion is to reduce respectively the the tension of the same difference coefficient so 115 should be 105 or 100 volt to avoid any possible damages that might occur, not sure if that is correct but that is what it was said....
But another guy stated that usually for heating and small motor appliances like toasters, blenders, mixers etc hertz difference usually never give problems, just for certain types of appliances with bigger and more sensible and complex motors that runs for long time like for ex a refrigerator compressor you could meet an hazard of overheating, motor effort and generally a reduced life of the motor. I've read in the same blog the example of the Japan where they have 100 volt 50hz but they use American appliances all the time and in US also use Japanes appliances with no problems....
Clock and lights issue:
I have a 70s Sears flip alarm clock that was of my granma, she gave me to bring with me to Italy when I was 10, it is my daily driver alarm clock and I use it with a portable travel converter 50 watts plugged there since 1999, it works like a charm with 50hz as well, never missed a second.
Now I'm not sure if it was supposed to work with both hertz but it states: 115 volt 60hz on the back label...
Not sure about a stove clock but if it is the same of my alarm clock it should work anyway I guess.
Lamps problem:
I have some lamps and lava lamps that I purchased from USA that still have 120 volt bulbs and works just as they should with the transformer...bulbs are nothing but heating elements so they shouldn't suffer changes of hertz.
So, personally I don't believe the hertz difference might be a problem even for an electric stove. I just told you what I think and what I've experienced and read, I'm not a tech maybe someone else might be more correct and give better advice/ info.
Personally I'd be more worried about importing costs though! LOL
Good luck