Bridging Boss Audio MR1308UABK Head Unit

I've been so ng the Google, and can't answer my questions...

First, the info. It's going on a 2013 Harley Electra glide police, I have a MR1308uabk boss audio marine head unit, and hogtunes 352f-aa speakers.

The questions:
The speakers are rated at 100w rms, 150w peak, the HU is 4x 50w. Can I wire together, front/rear, -/+ for left and right, as my Electra does not have rear speakers? I feel like this should work, and should be able to give me 100 Watts dual channel. Correct?

Second question, the HU states 4ohm+, and my speakers are 2. I understand what this means, but because you're sharing one impedance with two amplifiers, in the above bridged situation, does this counteract my low impedance issue? Logic tells me that the impedance would be split over two channels, and effectively would be 2x 4 ohm parallel speakers, which is what the HU wants. Do I have this correct?

Are there any other issues or things I've missed?

Worst case scenario, I will wire it up just two channel, with HU rears left disconnected, and will install a resistive something... Either a resistor or something similar that I've seen a few places mention is a good fix for speakers too low of impedance, to the HU.

Thanks in advance!

Pics for attention! https://www.instagram/p/CqhOcdcrQg9/igshid=YmMyMTA2M2Y=

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The 4 x 50 you speak of is actually 4 x 18 or so. The output chip of the radio does not work like bridging a bridgeable amplifier.   No matter how you wire it, you will not get any more power out of it.

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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB