wildcard SPF entry w/o wildcard MX entries

[harold1]

I'm trying to verify a potential entry that we could use for our SPF
DNS entry.
The uncertainty is that we do not currently use wildcards for our MX
entries or hosts, but would like to use a single wildcard SPF entry to
be used to validate all of the mail domains we host.

Given the following example

6 outbound MTA hosts with associated DNS A/ptr records
(no MX records, these are outbound only relays)
(Inbound is routed through different MTA hosts via MX records to
inbound MTAs)
	MTAout1.company.com	151.100.100.136 (mask = 255.255.255.224)
	MTAout2.company.com	151.100.100.137 (mask = 255.255.255.224)
	MTAout3.company.com	151.100.100.138 (mask = 255.255.255.224)
	MTAout4.company.com	151.100.100.139 (mask = 255.255.255.224)
	MTAout5.company.com	151.100.100.140 (mask = 255.255.255.224)
	MTAout6.company.com	151.100.100.141 (mask = 255.255.255.224)
These MTAs above are responsible for sending mail FROM "many"
multiple domains
We own the parent domain SOA (company.com)  and delegate multiple child
domains and "all" outbound mail from the child domains is routed
out via the 6 MTA hosts above.
Each child domain has their own inbound MX entry pointing to
"inbound" MTAs so there are many different DNS entries, one for
each child domain.
	Domain1.company.com	mx	MTAinbound.company.com
	Domain2.company.com	mx	MTAinbound.company.com
	Domain3.company.com	mx	MTAinbound.company.com
	Domain4.company.com	mx	MTAinbound.company.com
	...
	MTAinbound.company.com	A	151.100.200.140


Is it possible to use a wildcard SPF entry for the parent domain so
that we cut down on the number and management of SPF records in DNS?

I believe we can use an entry similar to what is listed below
v=spf1 ip4:151.100.100.128/27 ptr ~all

But can it be tied to ONE single SPF DNS entry with a wildcard as below
event though we don't use wildcards for the hosts or MX entries?

*.company.com 	IN 	TXT	"v=spf1 ip4:151.100.100.128/27 ptr ~all"

Thanks