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It should work, yes.

It really depends on what it is you 'overlay' on top your height map. Blending modes will give very different results depending on what it is you 'blend'.

As an example, my first image was a grey (127 RGB) line, the second was white. Each used a different blend mode but had they have used the same mode the result would still be different because of the different colours used.

If your 'roads' or whatever are simply black lines with a transparent background then you will probably find a completely different blend mode would work.

Blend modes are not really predictable as there are just so many variables so its usually a case of getting everything set up and then go through each mode until one fits what you want.

Used with layer opacity you should be able to get a reasonable result.

Regards.

MrToM.