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Hello and welcome!
Combining multiple antennas causes the effective gain of each antenna to decrease. That is because gain and directionality are very closely related (high gain requires high directionality and low impedance mismatch). Combining antennas pointed in different directions makes the system less directional, and thus it will lower the effective gain you would expect out of either antenna by itself.
You are also correct that there is risk of opening up the doors for more multipath to get in. There's no way to tell if multipath will become a problem or not until you try it.
The good news is that your signals are very strong overall. You don't actually need much gain to get most of your channels.
To combine the two bowtie antennas all you need to do is use a 2-way splitter in reverse. This will lower the effective gain of each antenna (but you probably don't really need the gain), and it will increase your susceptibility to multipath. However, it's easy enough to try and see how things work out.
If multipath does become a problem, then it means that there are too many reflections hitting your location and you're better off not using both antennas at the same time. An A-B switch would be the next best option at that point.
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