Why ruin the OLy and kill the value. Yes, I know it and the lenses are great but seems a shame. I'd suggest if you want a clear viewfinder look for an slr sans meter. An Asahi S1a or such is a very reliable tank that can had for nil and the m42 lens catalog is extensive and most of the lenses are fantastic values on a cost vs performance scale as well as just be excellent lenses. An Exacta with the removable viewfinder allowing either waist level or eye level finders likewise are excellent with some great glass available for the line. These can be had in excellent condition with a standard lens probably for less than paying someone to strip the meter from the OM-1. If your OM-1 had a non-functional meter my advice might be different.
For a little more you could even go into medium format with something like a Bronica ETR series camera and if you want to stay with 35mm get either or both the 35N normal back or the 35W panaramic back. These had non-metered prisms, rotary prism and waist level finder as well as 2 metered versions. It also, of course, is a 1st rate mf camera so, the best of both film sizes.
For metering landscapes depending on type either a spot or averaging meter works; just need to make sure you do not pick up too much sky with an averaging meter. I found the Weston Ranger with a metering of abount 12 degrees that is between the spot and averaging is excellent as it has an aiming lens similar to a spot. Also, the Metrastar has a similar angle of metering and uses an aiming lens. The Ranger is larger, and uses 2 batteries and does not feel like you could drive nails with it compared to the Metrastar but, the Zone System dial available for it is a great acc'y if you are planning to use it. I use both and like them equally. Neither costs an arm and a leg on the used market and as good as far more expensive meters. The company that made the Metrastar also made the Leica meters if you are not familiar with the company and I'm sure Weston needs no introduction.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
Choosing which tone to put in a given zone is something that you will determine with time. There are many good references if you feel you need some (and they look great on your darkroom bookshelf. ;>) ). You will eventually find a method that gives you the exposures you need. Going through the effort is often a good deal of fun.