"もを" is too unnatural, so use a comma instead of "も" in this list?

Question

Can I re-write this sentence:

このクレジットカードは国内、国外を問わず、いろいろな場所で使える。

as

このクレジットカードは国内も国外もを問わず、使える。

A good reason to have replaced the first "も" with "、" is to avoid the unfortunate, (but grammatically correct?), "もを" string of particles?

Answer 1

The correct sentence is:

このクレジットカードは国内か国外かを問わず使える。

This か is the question marker and forms an embedded question.

This should be straightforward because, in English, you should say "regardless of whether it's A or B", not "regardless of both A and B".

Of course you can also say it without 問わず at all:

このクレジットカードは国内でも国外でも使える。

But note that 国外でもを is ungrammatical because ～でも (="also in ～") is an adverbial phrase which never serves as an object marked with を.