It is certainly permissible for non-members of the Convention to suggest amendments. However, I would assume that the Convention retains the power to ignore frivolous proposals.
It's just that I may have one or two amendments I'd like the Convention to consider
I agree the Convention should include some senators as well as others
It's just that if I'm not appointed (I'm not actively seeking to be appointed), I'd still like to contribute
'Hawk'
This is a rather delayed response, but I don't believe senators should be actual members of the convention. They should absolutel be able to advise the convention and propose things, but the original purpose of the convention was to give the common citizen the right to amend the constitution. Having the senate sit in and vote kind of defeats the purpose, I believe.
I don't believe the Senate should dominate the convention, but I disagree that they should be excluded. If you eliminate all federal officeholders, you're eliminating many of the most active and most knowlegable members.