I have a Swiss vetterli in 10.4x38 ( i think that is correct.) i make cases from lebel brass.. and yes it is a single shot as the spring no longer is in the tube magazine and several parts are missing.. It is much uglier than your rifle but i must say i have had a lot of fun with ugly rifles. i made a front sight and i think used a Remington rear sight. milled the site to fit the large dove tail. anyway these old ugly rifles are a lot of fun to shoot. and again if there was a contest for the ugliest rifle i know i would win hands down with mine. 
argie1891    

and please dont give me a bad time as it was a repeater but has not been one for many years.

Clamping the scope mounts to the barrel rib is a good short term solution. It allows the use of LER scopes and allows full access to the action for loading and extraction. It just doesn't look as clean as the rifle's original claw scope mounts.
Now that you are retired, there is no excuse for not fitting a set of claw mounts to your rifle's scope bases. 
The Martini action will require a higher scope height for ease of operation and it wouldn't surprise me if your stock was designed with this in mind. If this is the case, mounting the scope clamped to the rib, may be harder to acquire than one a little higher.
You probably, already have the answer, after your trip to the range.
Otto

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