Any ideas on how to do that?
no, but some ideas to throw out for disussion (in no particular order):
1. numeer of convention delegates be related to the number of republican electors sent to tthe last electoral college.
2. number of delegates be related to the number of republican congress-critters and senators.
3. delegates be selected on a county by county basis (so more conservative upstate counties have some influence).
4. delegates be selected in proportion to the total vote for each candidate on a statewide basis. I think this is similar to what the democrats are doing this cycle, except they have the superdelegates.
On diluting the impact of the large liberal states - or - keeping the opinions of the smaller conservative states from being overlooked:
a. states are allowed to select their primary date in SIZE order, so the large states are not all at the same time, or even too close to each other (assuming the primaries are a month apart as you suggested)
b. more conservative states have their primaries earlier.
What do you think?