Closing gaps is far better done with train track style braces. It can be done with Invisalign but it is a very difficult movement and the success may be limited.
Your concerns about opening up other gaps is right on. If your teeth are the wrong size for your mouth, the solution will most likely be veneers. However it is not a case of 2 veneers to close th space. teeth should be a certain size and proportion to one another and if you just place 2 veneers you may disturb this balance.
It may be for yourself that the best result would be achieved by a combination of bracework and veneers. Without a full consultation it is difficult to say
I hope this answers your questions
Kindest regards
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