It's much the same way as if a PC had some template that boosted his intelligence. He'd be out a few levels, and get some bonus skill points (and probably other abilities).
If you just wanted to go full-speed powergamer here, you could (in the revised rules) make a Hero 4/Rogue 1 with a natural 18 Intelligence. With your 32 Hero Points you could get an effective +X Intelligence, purchased in several powers.
Super Smart 1. +8 to Intelligence checks, +8 skill points/level. 8 ranks (8 HrPs). Total cost 16 ranks (30 HrPs).
Super Smart 2. 4 ranks (8 HrPs).
Super Smart 3. 2 ranks (6 HrPs).
Super Smart 4. 2 ranks (8 HrPs).
Skill Knowledge. You get 4 bonus skill points. 2 ranks (2 HrPs).
You end up with a 5th level character with 82 skill points. A pure 5th level Rogue with an 18 Intelligence would have 96 skill points. Now, if we continued this so we have higher level versions of each, things get more disparate. Hero 4/Rogue 6 (the change in level alters the layout of points, so now we get 20 ranks for +10 skill points/level) with 198 skill points vs. Rogue 10 with 120 skill points.
You could instead choose to make a Hero 4/Wizard 1 with an 18 Intelligence, and these abilities:
Heightened Intelligence 1. +8 to Intelligence checks, +8 skill points/level. 8 ranks (8 HrPs). Total cost 15 ranks (26 HrPs).
Heightened Intelligence 2. 4 ranks (8 HrPs).
Heightened Intelligence 3. 2 ranks (6 HrPs).
Heightened Intelligence 4. 1 rank (4 HrPs).
Heightened Defense. +3 luck bonus to AC. 6 ranks (6 HrPs).
He'd end up having a 28 Intelligence, 4 1st level bonus spells, and 52 skill points (vs. 5th level mage with 18 Intelligence, lots more spells, and 64 skill points).
So your plan isn't useful at this low of a level. You put too high a ratio of Hero levels in. More than half is probably a waste if you just want skill points.