A Question for Our Scandinavia Experts

Something that I've been wondering about lately (mostly because I think it may become relevant at some point in my own TL) with regards to the early modern or late medieval monarchies in Denmark, Norway, and Sweden, is, basically, who can be elected as the new monarch? I understand that it was often hereditary, but in those cases where a king was despised or heirless it seems as though there was a wide range of possible choices. Specifically, local nobles, German nobles, and other Scandinavian kings seemed to be popular choices.

More specifically, I'm asking about other foreign monarchs. Particularly with Norway and Sweden, would a strong western European Monarch with blood ties to the previous monarchy have a chance at being elected king? I imagine that most OTL examples are barred by religious differences, but supposing there weren't any, either the reformation doesn't take hold over Norway and Sweden, or the brand of Protestantism there is similar to the one established in parts of western Europe. In such a scenario, would a French or English king have any chance of forming a personal union with Sweden or Norway?
 
I'd say very little chance. When picking a king, you don't want to end up with

a) someone who spends all his time dealing with more important domains elsewhere (why even bother with having such a king?),
b) someone with the power to threaten your rights (e.g. by assembling a foreign army and bringing it in as a loyal occupation force), or
c) someone who doesn't understand the country (e.g. by being foreign in upbringing and nationality).

It could be doable if the foreign king happens to be the only living relative of the former Scandinavian king, but even then they'd likely elect someone more local, like Sweden in 1448. Another example of a Northern European elective monarchy doing its best to avoid such a personal union is Poland in 1575.
 
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