Running Two TT into one phono input, best options?

Uber, If you are hoping for someone to tell you there is a perfectly transparent switch to solve your problem, you are hoping in vain.  I do know that Dave Slagle of EMIA can make you a fantastically good switch to solve your problem, but even he would probably not want to claim it's going to be perfect.  Using two Y adapters is absolutely the worst idea, IMO, because that does crazy things to the impedances seen by both the two cartidges at one end and the phono stage at the other end.  I wouldn't go with something cheap in hopes it will sound great.  When you come right down to it, plugging and unplugging ain't so bad.

Lewm
I do not expect there to be a perfect solution I agree but was hoping for some opinions that might be workable.

So far I have three considerations.

1/ The Decware switch with low level tonearm inputs. Would like to hear a reply to my question to them about what they changed first but it does have a 30 day money back guarantee.
2/ A Denon AU-320 SUT. This is a unit I have owned and used in the past with great results, it has 2 inputs, 1 output and is switchable from 3ohm to 40ohm to straight pass through. I honestly did not notice any readily audible difference when I last used one.
3/ A fairly cheap MM only phono stage to run the Rega mono table into and remove one of the tape decks from my system thereby freeing up a single ended input. Then both the 401 and the Avid could run into the Goldnote PH-10 phono.

I also went thru this recently, started a thread, found a few options, members added a lot to the discussion and suggested choices

https://forum.audiogon.com/discussions/phono-eq-small-inexpensive-two-phono-inputs

For MM, any simple RCA a/b switch will do it, I had an old small Sony Video Switcher, a,b,c,d in, 1 out. Best arm/cartridge direct to phono 1, a/b switch to phono 2 for the other 2 arms.

Then I decided to enter the world of Moving Coil

Any Step Up Transformer (SUT) with a combination of 2 selectible inputs, and PASS will do it, that lets you keep using your existing preamp’s phono, 1 direct, 2 thru SUT.

I got this, 3 selectable inputs. I love it, versatile options for MC, and PASS for MM, separate selector for the 3 rear inputs. You could run all 3 arms thru this, then into your Phono 1 input, use any combo of MM/MC, 

https://www.ebay.com/itm/Fidelity-research-FR-FRT-4-Toroidal-Transformer-In-Excellent-Condition/333648114135?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Luxman made switches under their top class turntable as as option to connect phono cables from two tonearm to one little box (located under the turntable). It was made in the golden age of analog for use with phono cartridges of that era.

A separate Luxman Line Selector Box is very easy to upgrade with modern high-end components (and a bit of soldering skills). I've seen this box in use with high-end tonearms, can't remember, i think it was on youtube. I believe this box is a good quality. 

The best solution is a phono stage with as many phono inputs as you need.

This was the reply from Decware on the changes to their box for low level tonearm inputs.

" Kevin, for tonearm applications we do not add the splitting resistors on the dual output jacks. Nothing internal but silver wire and silver switch."

For now I have decided to take option 3 from my short list and will be running the Rega mono table into its own simple MM phono and into a single ended input on my BAT.
Thanks to all for there help here