For around $75.00 + the T-stat (which you probably already have for the 100 gallon tank.) you can build a nice 32qt 3 tub rack. Price includes flex watt and tubs. As a general rule for building buget racks I put the price down as $25 per level + the overall cost of the T-stat, but if you go less than 3 levels the cost overall goes down, but the cost per level goes up and vise versa if you go taller. If I put my mind to it I can easily build one on a day off. At this point no reason exists to do what you are intending to do since you already have some kind of seperation due to quarantine that you can keep up for another week or two while you build the rack.
On the other hand if you do have to do it you should be OK as far as actual breeding possibly taking place since the female will not cooperate. The only additional issue I see here is you will have 2 males and 1 female in an enclosure if I am reading it correctly. I'm not sure if this may cause some fighting between the males as part of the mating ritual. I have never personally put two males together in one enclosure and do not really have any intention of trying.