Scrap Beast vs Key Mouse, and Naturia Tapir

I came to realize that there are a couple main problems with the Naturia Tapir deck. The 1st issue is Pineapple, a good card, but because the deck runs plants, the only synchro options are Splendid Rose and Queen of Thorns. Really, synchro is the main problem in the deck. Of course, Naturia Beast is a great monster to sync into, but the way how these recent beast decks work is to synchro into Unicorns very easily, which can't be done in this Naturia deck. I believe a proper "Naturia Tapir" deck would use Beast, Rose, and Queen as convenience synchros, rather than being a synchro-centric deck. That means that the rest of the deck will probably be more aggro. It may even be able to run Moja along with D.D. Crazy Beast, Bazoo, or other similar aggressive beasts that Dark Desertapir can special summon.

Focusing back onto Unicorn Synchro, I'm still contemplating Lock Cat and Key Mouse versus Scrap Chimera and Scrap Beast. Both do essentially the same thing, one card is a tuner, the other can SS the tuner from the graveyard. Pretty simple stuff.

Pros:

Scraps: Level 4 for 1-2 card synchros with Mine Mole. Searchable by Scrapyard. Basic attack rating. Synergy with Scrap Dragon, which is rare in this format.
Cat and Mouse: Evades Bottomless Trap Hole! Destruction effect, setting a key mouse on the field actually benefits me. Level 1 Tuner, so it can be used with mind control on enemy synchros to make just about anything, and let's not forget Formula Synchron in Starstrike Blast.

Cons:

Scraps: Bottomless trap hole target. Useless destruction effect that can only be used with Scrap Dragon. Can't be searched by Giant Rat, Hamster, or really anything but scrapyard.
Cat and Mouse: No attack rating. Level 1 tuner so a 1-2 card synchro leaves me with an empty field, whereas a Chimera play to make Bicorn leaves Chimera on the field.

I really need to test a few more builds. One using Cat and Mouse instead of the scrap engine, and one using both "Lockey" and Scraps in the same deck. Since Unicorn synchro uses Elephun as an intermediate tuner, they can be replaced by 2 Mice, then the only other thing is to find a replacement for 2 Cats, which may be the 2 scrapyards.